25．In the conference room on the fifth floor where a meeting some students were busily s

问题补充：

25．In the conference room on the fifth floor, where a meeting, some students were busily setting the chairs.

A. was to be held

B. has been held

C. will be held

D. is being held

答案：

(答案→)A. was to be held

B. has been held

C. will be held

D. is being held

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