________hewillcometotheconcertisnotyetknown.A．If       ...

问题详情：

________ 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