问题
选择题
--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
答案：D
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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