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

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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
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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
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

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