作业帮The first satellite ______ telephone signals was called Early Bird.A.was used to sendB.used to be sentC.was used to sendingD.used to send
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The first satellite ______ telephone signals was called Early Bird.A.was used to sendB.used to be sentC.was used to sendingD.used to send
The first satellite ______ telephone signals was called Early Bird.
A.was used to send
B.used to be sent
C.was used to sending
D.used to send
The first satellite ______ telephone signals was called Early Bird.A.was used to sendB.used to be sentC.was used to sendingD.used to send
答案：D.
翻译：第一颗用来发送电话信号的卫星叫做“晨鸟号”.
1.此题关键在于对句子结构的判断.
2.句子主语是the first satellite,谓语为was called.
所以____ telephone signals在句中不能做谓语,只能做（后置）定语修饰句子主语the first satellite,即“第一颗...的卫星”.
3.首先可以排除A/C了.
因为A/C的结构在句中只能做谓语,不能做定语.
比如：The satellite was used to send telephone signals.
这颗卫星（过去）被用来发送电话信号.
The satellite was used to sending telephone signals.
这颗卫星（过去）习惯于发送电话信号.
4.而答案D中,used to send其实还是be used to do sth（被用来做某事）的变化.
因为主语the first satellite和此结构中的动词use之间为被动关系,所以用过去分词used所引导的短语做后置定语.
可以这样理the first satellite used to send telephone signals（此为用过去分词短语做后置定语）
= the first satellite (that was) used to send telephone signals （这是用定语从句做后置定语）
被用于发送电话信号的第一颗卫星
5.答案B中的send和the first satellite之间还是主动关系,所以用to send而不是to be sent.
6.此用法对应初中生较难理解,但是在高中是经常考试的.
再给楼主一个例子,如：
I don't know the boy called Mike.
= I don't know the boy (who was) called Mike.
我不认识那个（被人）叫做迈克的男孩.
D