________crossingthestreet,________t

发布时间：2020-07-10 06:36:29

________ crossing the street, ________ the cars and be careful.













A.If, see to












B.While, watch out











C.While, watch out for











D.Before, watch

网友回答

C解析Cwhile +v-ing短语在句中作状语，当心要用watch out for.
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