The haze or smog was so serious that the winter running _________.Some students complained as they ran
A．could have cancelledB．should have cancelled
C．must have been cancelledD．ought to have been cancelled
D

試題分析：考查情態(tài)動詞。根據(jù)句意可知本題表示“本應當……”，故用should have done或ought to have done。再根據(jù)主語the winter running與動詞cancel之間為被動關系。句意：霧霾是如此的嚴重，所以冬季跑步本應當被取消，一些學生在跑步時抱怨。故D正確。
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