When questions in class, one should answer them as clearly as possible.A．asking B．to ask C．to be asked D．asked 题目和参考答案——青夏教育精英家教网—

When ________ questions in class, one should answer them as clearly as possible.

A．asking

B．to ask

C．to be asked

D．asked

解析试题分析：考查省略。句意：课堂上被提问时，应尽可能清楚地回答。当主从句的主语一致的时候，可以省略从句的主语和be动词，本句前半句实际上是when one is asked questions in class 的省略。C 项表示“将要被提问”，不合乎语境。选D。
考点：考查省略

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