He was taken away by the police. He a very serious crime.A. must be committedB. was being

问题补充：

He was taken away by the police. He a very serious crime.

A. must be committed

B. was being committed

C. must commit

D. must have committed

答案：

A. must be committed

(答案→)B. was being committed

C. must commit

D. must have committed

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