【題目】Tom is skilled and he knows all about the machine. I think that is _____ he was picked.

A. whether B. when

C. how D. why

【答案】D

【解析】

考查表語從句。句意：Tom技巧純屬，他了解所有的機器，我認為這是就是他為什么被挑中的原因。A項whether意為“是否”，when指時間，how指方式，why表示原因。根據(jù)上下文句意可知表示原因。故D項正確。

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