题目内容

Mr Green didn’t know ______ last night.
A.when does his son come backB.when his son comes back
C.when his son come homeD.when his son came home
D
动词know后跟的是一个宾语从句,要用陈述句的顺序,故A不正确,主句是过去
时,从句要用过去时一种,只有D用的是过去时,故选D。
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