While(cross)___the street.I saw someone waving to me.

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While(cross)___thestreet.Isawsomeonewavingtome.While(cross)___thestreet.Isawsomeonewavingtome.While(

While(cross)___the street.I saw someone waving to me.
While(cross)___the street.I saw someone waving to me.

While(cross)___the street.I saw someone waving to me.
crossing
while doing sth 做某事的时候
过街的时候,我看到人对我招手

crossing

当我穿过街道的时候,我看见有人在向我招手

crossing

crossing
强调两个动作同时进行,当我正在过马路的时候有人向我招手。

crossing