You'd better make sure when the train______A.will leave B.is leav_英语解答

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：465 ℃　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