You'd better make sure when the train______
A.will leave B.is leaving C.leaves D.left
答案应该选C,原因是什么?
人气：463 ℃ 时间：2019-08-27 07:40:53
解答
when引导的从句是一般现在时,主句是过去式,这是主将从现的句型,与if一样,要熟记
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