Although the teacher had told Bob the history of telephone, Bob didn’t know when . A. it w

Although the teacher had told Bob the history of telephone, Bob didn’t know when .
A. it was invent
B. was it invented
C. it was invented
D. it invented

A. it was inventB. was it invented(答案→)C. it was inventedD. it invented解析：考查宾语从句和被动语态。句意为：尽管老师给鲍勃讲了电话的历史，但他还是不知道电话是什么时候发明的。首先，宾语从句要用陈述句的语序，即：连接词+主语+谓语+其他，所以B不对；另外，it（电话）是invent（发明）的承受者，所以要用被动语态（be+过去分词）。故选C。

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