单选题Mr Green didn’t know&nbsp

问题补充：

单选题MrGreendidn’tknow______lastnight.A.when does his son come backB.when his son comes backC.when his son come homeD.when his son came home

答案：

D解析动词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。