when ( ) questions in class,one should answear them as clearly as possible.为什么选Dasked 不选Cto be asked

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when ( ) questions in class,one should answear them as clearly as possible.
为什么选Dasked 不选Cto be asked

when引导的时间状语从句,省略主语和动词,when (one is) asked questions in class,he should answear them as clearly as possible