问题补充：
--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
答案：
A. when does the train leave
B. that we will plant trees or not
C. if she had come yesterday
(答案→)D. what I should buy for him
解析：本题考查的是特殊疑问句作宾语从句，应该用陈述句语序，故选D
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