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