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Ive no idea when shell be back. ______you wait or come back later is up to you.
A.When
B.If
C.Whether
D.That

A.
A.When
B.If
C.Whether
D.That


【参考答案】

C
根据题句意思可以判断,空白要填入的词在意思上表示选择,在结构上引导主语从句。而且细心的考生很快就会注意到题句中有or一词.这就给我们以提示,即排除A项和D项,因为if…or…和whether…or…都是关联使用的连词。A项when也可以主语引导从句,但意思上表示时间;D项that引导主语......

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