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29._______the road,be careful.

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29._______the road,be careful.
A.While
crossing B.When
cross C.Crossed D.
Being crossed
29._______the road,be careful.
选A.
解析：这个是祈使句,暗含的主语是you,You 和cross the road 是主谓关系,不能用被动,排除C、D.A正确,这是 while you are crossing the road,be careful.的省略,选B的话把cross改为crossing就可以了.
祝开心~!
29._______the road,be careful. Be careful ------you ----the road ---(be) more careful while crossing the road You should be careful when you cross the m____ road . Be careful when you walk cross the road改错 be careful of the children ____ (cross)the road. 填空 we must be careful when we___ the road road cars be the about the careful on Paul,______（be） careful when you cross the road. You must be careful to c_the road.It's dangerous. Be careful when you ______ _______ the road. We must be careful when we（ ）the road.