________hewillcometotheconcertisnotyetknown.A.If       ...

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________hewillcometotheconcertisnotyetknown.A.If       ...

________ he will come to the concert is not yet known.

A.If                                B.Whether

C.That                              D.Which

【回答】

B 根据句子的表语可知应填表示“是否”的词,排除C、D两项。if不能引导主语从句。

知识点:连词

题型:选择题

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