It is when the planethat you’d better find out at the book office.A. will take offB. is go

问题补充：

It is when the planethat you’d better find out at the book office.

A. will take off

B. is going to take off

C. is taking off

D. takes off

答案：

A. will take off

B. is going to take off

C. is taking off

(答案→)D. takes off

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