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    精英家教网 > 初中英语 > 题目详情
    Although the teacher had told Bob the history of telephone, Bob didn’t know when ____.
    A．it was inventB．was it inventedC．it was inventedD．it invented
    C
    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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