When ________ questions in class, one should answer them as clearly as possible.
A．a(chǎn)sking B．to askC．to be askedD．a(chǎn)sked
D
 本題考查省略。句意：課堂上被提問時，應(yīng)盡可能清楚地回答。本句前半句實際上是when one is asked questions in class的省略。C項表示“將要被提問”，不合乎語境。
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