Better go and ask him when he______. We must see kim off when he ______.

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问题 Better go and ask him when he______. We must see kim off when he ______.

选项 A、is leaving; leaves
B、leaves; is leaving
C、leaves; left

答案A

解析 第一句中when 引导的是宾语从句,由于句意是指“他什么时候走”,含动作尚未发生之义,所以谓语动词用进行时形式表示将来;第二句中when 引导的是时间状语从句,虽然动作也未发生,但通常用一般现在时代替一般将来时。
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