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The haze or smog was so serious that the winter running .Some students complaine

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The haze or smog was so serious that the winter running .Some students complaine

The haze or smog was so serious that the winter running _________.Some students complained as they ran

A.could have cancelled B.should have cancelled
C.must have been cancelled D.ought to have been cancelled

试题答案

D

解析试题