_be careful when crossing the street.
A.Must B.Should C.Ought to D.Do
我选的是B,
人气：452 ℃ 时间：2020-03-27 18:33:20
解答
因为这个句子没有主语,所以你不能选ABC,因为ABC都是情态动词,不能直接放在句子开头,而必须要接主语.所以只能选D,表示强调.
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