when doing 和upon doing和 once doing的区别

caddiechen0012022-10-04 11:39:545条回答

when doing 和upon doing和 once doing的区别
the beggar turned around and left__ seeing the police coming.
a.once b.the moment c.at d.upon

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paul114 共回答了18个问题 | 采纳率72.2%: when doing:着重一边一边,同时发生
upon doing:由于怎么样了,所以怎么样
onec doing:做了某事之后才怎么样; 1年前

sdlswqh 共回答了1个问题 | 采纳率: 选a
若选b则应该是the beggar turned around and left the moment when seeing the police coming.; 1年前