问题
选择题
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
答案：B
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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：B
