The mobile phone has influenced our life a lot since it ．( )A．inventsB．is inventedC．was invented 题目和参考答案——青夏教育精英家教网—

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20．The mobile phone has influenced our life a lot since it_____．（　　）

A．

invents

B．

is invented

C．

was invented

分析手机自从发明以来就影响着我们的生活．

解答答案：C．
结合句意可知动作发生在过去，故用一般过去时，主语it是动词invent的承受者，故用一般过去时的被动语态was/were+过去分词，主语it，故was，故答案是C．

点评被动语态由"助动词be+及物动词的过去分词"构成．被动语态的时态变化只改变be的形式，过去分词部分不变．疑问式和否定式的变化也如此．

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