题目内容

— I don't know_   .
— You can go and ask Jack.
A.when does the train leave B.that we will plant trees or not
C.if she had come yesterday D.what I should buy for him
D
宾语从句语序的用法。I don't know后为宾语从句,要用陈述语序,故A错,C应该为过去时,不是过去完成时,由答语知道是给Jack买东西的,D又是陈述语序,故选择D。
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