问题
选择题
I don't know _______.[ ]
A. when will the train arrive
B. will the train arrive
C. the train will arrive
D. when the train will arrive
答案
答案：D
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I don't know _______.[ ]
A. when will the train arrive
B. will the train arrive
C. the train will arrive
D. when the train will arrive
答案：D