题目内容
【题目】I am quite busy. I don't know ________ I'm free or not tonight.
A.ifB.unlessC.whetherD.when
【答案】C
【解析】
略
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题目内容
【题目】I am quite busy. I don't know ________ I'm free or not tonight.
A.ifB.unlessC.whetherD.when
【答案】C
【解析】
略