saw him playing in the street a moment ago and l told him( )

问题描述:

saw him playing in the street a moment ago and l told him( )
a.don"t do so
b.not to do so

选b
原因:tell sb.to do sth告诉某人做某事
tell sb.not to do sth告诉某人不要做某事
刚刚我看见他在路上玩儿,而且我还告诉他不要这样做.(暗含意思:在路上玩儿危险)