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【题目】____________he’ll be able to come is not yet known.

A.ThatB.IfC.WhetherD.What

【答案】C

【解析】

考查主语从句。句意:他是否能来还不知道。根据is not yet known可知,此处是主语从句,连接词在从句中表示“是否”,应使用whether引导,if不能引导主语从句。故选C

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