Event is so happy _seeing her old friend again.a.at b.onc.by

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Event is so happy _seeing her old friend again.a.at b.onc.by d.up选?

a
再问：但是答案是b .on
再答： .on是表示时间的介词“一...就...”，它等于as soon as，但前者后面接动名词作宾语；后者是连词，后面要跟句子。所以答案是正确的。
再问：请再写的详细点，没理解你的意思？
再答： on用以表示某一特定场合：On entering the room, she saw him.她一进这个房间便看到了他 Event一见到她的老朋友就是如此地开心。

Event is so happy _seeing her old friend again.a.at b.onc.by 连词成句I,to,happy,my,friend,see,again,old,so,am so many A;why did shi look at her son?(happy)B:because so ma she is so happy that there ___ on her face.A is a smile B is Don't play outside__this heat. A.at B.onC.in ____Emily at her uncle's house last night?I think so A is B The old man is badly ill and he needs ___ to hospital at onc The teacher was made by the little girl again.A.happy B.happ A:Gread,weekend again!I am so happy .( ).B:I'd like to do sp 4.The grammar books ___ again and again by bus.A.is read B.a The bike is _____ old for me _____ ride it again.(A.so,that Helen is a friend of___.A.hers B.her