题目内容

7．When to go to see the movie THE BABYSITTERS CLUB_________ yet．（　　）
A．are not decidedB．was not decided
C．has not been decidedD．have not decided

分析 什么时候去看电影THE BABYSITTERS CLUB还没有决定下来．

解答 答案是C．考查被动语态，When to go to see the movie 在句中做的是主语，谓语动词应该用单数，When to go to see the movie 指的是一件事，事情应该是被决定，所以用被动语态，yet表示现在为止仍然，所以用现在完成时的被动语态，故答案选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．掌握各种时态的被动语态是解题的关键．

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B．twins are more likely to suffer from speaking problems
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