The experts from the zoo were convinced that the animal was a puma,but where had it come from 为什么不用where did it come from

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The experts from the zoo were convinced that the animal was a puma,but where had it come from 为什么不用where did it come from
The experts from the zoo were convinced that the animal was a puma,but where had it come from
为什么不用where did it come from

The experts from the zoo were convinced that the animal was a puma,but where had it come from 为什么不用where did it come from
had come是过去完成时,表示过去的过去发生的动作.原句中were convinced动作发生在come之后.

所用时态是过去完成时态,表示过去的过去,是在专家相信前,所以用这种时态;一般过去时表达不出这种意思。

many people,most of them experts from america attended the conference 请高手分析一下句型 The experts from the zoo were convinced that the animal was a puma,but where had it come from 为什么不用where did it come from Experts say the easiest way to prevent the virus is to import birds from flocks that are disease-free. The _at the meeting will discuss the_ in the worldA,present experts;present situationB,present experts;situation presentc,experts present ;situation presentD,experts present ;present situation 英语翻译:experts (call )in from many parts of the world to construct the domes and to decorate the walls .另外call 在这里用什么形式? 分析新概念3中的一句句子The experts from the zoo were convinced that the animal was a puma.这里为什么是was puma? if you have any problem regarding hepatopathy,please reach us at 0423,then you will get the most professional medical guidance from experts at the least cost.3848 看一下这句子是什么状语从句,表原因还是时间?.as the evidence began to accumulate,experts from the Zoo felt obliged to investigate 英语翻译Many of the murals are already sagging or peeling from the earthen walls,their delicate beauty faded away.Others have deteriorated beyond the repair efforts of Chinese and foreign experts,including workers from the Getty Conservation Inst Thanks to the efforts to the experts from WHO and to be fair to pigs ,the name of the virus was changed from Swine flu to H1N1 flu 10 days later.句中to be fair to The _at the meeting will discuss the_ in the world选择题The _at the meeting will discuss the_ in the worldA,present experts;present situationB,present experts;situation presentc,experts present ;situation presentD,experts present ;present situatio The key to _ and recovering from subhealth,according to some experts,is to form good living habitsA.stopping B.preventing C.protecting D.avoiding 英语翻译翻译:it's how experts see the future Experts credit the drop to improvements in public health measures. 高一一道英语语法题Five experts attended the party,including two foreigners.Five experts attended the party,-------- -------- ----------. 英语提问:为什么在以下这句话中不使用定冠词the.Experts from the Zoo felt obliged to investigate,动物园的专家觉得有必要进行调查.我觉得这里的experts有from the Zoo做后置定语修饰,是特指动物园的专 英语翻译Responding to a resquest from the United Nations’ committee on world food security ,a group of experts in the field looked at the projected effects of climate change on 22 of the world’s most important agricultural products. Pool experts have determinded the proper levels of chemicals that must-------in pool water to protect the swimmers from infection and the equipment-------corrosion and damage.Chlorine keills harmful organisms,but it won't work properly if the alkalin