--- I don't know_______.--- You can go and ask Jack.A.when does the train leaveB.that we will plant trees or notC.if she had e yesterdayD.what I should buy for him
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D解析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。