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Tom is skilled and he knows all about th...

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

 

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。A项whether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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