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18、—Tom is never late for work. Why hasn’t he come yet now?

—Something          to him.

A.must have happened        B.should have happened

C.could have happened       D.must happen

18、D

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—Tom is never late for work. Why hasn’t he come yet now?

—Something          to him.

A.must have happened        B.should have happened

C.could have happened       D.must happen

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