最好能给我讲一下语法.Children are warned to be careful when ______ the street.A crossing B.crossed C.being crossed

分类: 作业答案 • 2022-07-27 21:27:21

问题描述：

最好能给我讲一下语法.
Children are warned to be careful when ______ the street.A crossing B.crossed C.being crossed

答

crossing
省略成分 Children are warned to be careful when （they are crossing）the street