when ( ) questions in class,one should answear them as clearly as possible.
题目
when ( ) questions in class,one should answear them as clearly as possible.
A asking
B to ask
C to be asked
D asked
选D,为什么不选C
答案
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
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