The reason for his success is ______ he worked very hard.A．whyB．thatC．whetherD．_刷题宝

题干

The reason for his success is ______ he worked very hard.

A．why

B．that

C．whether

D．how

上一题下一题 0.85难度单项选择更新时间:2010-07-28 10:28:52

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