问题
选择题
I'm not sure when the plane will ______ and when it will land.[ ]
A. take off
B. run off
C. open up
D. stay up
答案
答案：A
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I'm not sure when the plane will ______ and when it will land.[ ]
A. take off
B. run off
C. open up
D. stay up
答案：A