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【题目】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】

考查表语从句。句意:Tom技巧纯属,他了解所有的机器,我认为这是就是他为什么被挑中的原因。Awhether意为是否”,when指时间,how指方式,why表示原因。根据上下文句意可知表示原因。故D项正确。

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