Evevr since then,the programme has _____ great success,mainly because the birds now being set free are Mexican birds illegally caught in the wild.A.enjoying B.been enjoying C.enjoyed D.an nejoyment

Evevr since then,the programme has _____ great success,mainly because the birds now being set free are Mexican birds illegally caught in the wild.A.enjoying B.been enjoying C.enjoyed D.an nejoyment
Evevr since then,the programme has _____ great success,mainly because the birds now being set free are Mexican birds illegally caught in the wild.
A.enjoying B.been enjoying C.enjoyed D.an nejoyment

Evevr since then,the programme has _____ great success,mainly because the birds now being set free are Mexican birds illegally caught in the wild.A.enjoying B.been enjoying C.enjoyed D.an nejoyment
B 现在完成进行时 since then 从那时一直到现在,这段时间内发生的事

选B.
从has上明显可以知道这里是需要填完成时，排除A、D。
从since then 看出从过去开始到现在一直保持的动作，所以要用现在完成进行时，并且还有可能继续保持下去。

选B, 现在完成进行时,一直到现在都成功,从下句可知现在依然进行着.C 完成时表完成结束

选B 从饿since then.have been doing ,把它翻译成一直xxx

B 是现在完成时。句意是：从那以后，这套方案一直取得着巨大成功，主要因为这些现在被放飞的鸟是在野外非法捕捉的墨西哥鸟。

B

Evevr since then,the programme has _____ great success,mainly because the birds now being set free are Mexican birds illegally caught in the wild.
A.enjoying B.been enjoying C.enjoyed D.an ...

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Evevr since then,the programme has _____ great success,mainly because the birds now being set free are Mexican birds illegally caught in the wild.
A.enjoying B.been enjoying C.enjoyed D.an enjoyment
答：上面的老师们回答非常好！我也想过这个答案。初看这题时，就觉得后面的原因状语从句有点莫明其妙，对做题也没有多大关系。所以一直在BC中徘徊。
后经搜索，发现此题句摘自：2009年普通高等学校招生全国统一考试（湖北卷）阅读理解B题第二段第一句：
Ever since then, the programme has enjoyed great success, mainly because the birds now being set free are Mexican birds illegally caught in the wild, confiscated （没收） on arrival north of the border, and raised by their parents in the safety of the programme.
参答案很有可能是C。
评：因为上下文并没有给全。所以从逻辑上并不能确定这里必须用C。
从语法（词法）上，这里的enjoy 也可以用于进行时态，也不能排除B。
所以这题有两个答案，并且最佳答案不一定是C, 这是出题者所没有想到的。
再来看它的第一个选项，has enjoying, 明显的错误的时态结构，此选项没有干扰性 可以看出，出题者很随意，不懂出题原则。
本题是考查时态的，前三项都与助动词has能构成（或A好象能构成）一种时态，而第四个选项却是一个名词，has an enjoyment 是动宾结构，后面还加上个名词词组：great success, 句子明显不通，这个选项也如同虚设。
稍懂一些时态和句子结构的同学都能很有把握地首先排除AD。
而留剩下的两个选择项却让人左右为难。
所以这是一道有争议的题，也是一道有明显失误的题。

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B 前面ever since then时间状语表示完成概念，后面表现在状况。

B.
ever since then与常与现在完成时连用，本句强调“获得成功”尚未结束，故选B

B

B 现在完成进行时

B现在完成进行时表示从过去的某一时刻到现在为止一直在做某事。