The meeting will begin at ten.So you have to be there 9:50.A. aboutB. byC. afterD. unti

问题补充：

The meeting will begin at ten.So you have to be there 9:50.

A. about

B. by

C. after

D. until

答案：

A. about

(答案→)B. by

C. after

D. until

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