【题目】____________he’ll be able to come is not yet known.
A.ThatB.IfC.WhetherD.What
在线课程【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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