_____ finishing his homework,the boy was allowed to play wit

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_____ finishing his homework,the boy was allowed to play with his friends.A on B after,
为什么不选A?一完成作业,男孩就被允许和朋友玩.

肯定是after,on用在这里明显不对,没有你说的这种用法
你说的那个应该是
1.once 最常用,I will call you once I get the ticket.
2.soon after,I will call you soon after I get the ticket.
3.as soon as,I will call you as soon as I get the ticket
再问： On seeing the snake, the girl was very frightened. on+doing,不是有 "一。。。就。。" 的意思吗
再答：你说得对可是把on放在上题中的句子中就不合适了，因为后面一句是被动语态，on+doing应该是用在主动句中的。

_____ finishing his homework,the boy was allowed to play wit After he hard finished his homework,the boy was allowed (wat The boy felt unhappy because he was not allowed to play comp The boy was _____（play）basketball . After finishing his homework he went on _____ a letter to hi After____(finish) his homework ,the boy went on___(play)comp the boy having finished his homework was playing the compute we went to bed after he finishing his homework改错 ( )the boy write his homework? when ()the boy()his homework The little boy has to c______________ his homework first. with the homework ____,he was allowed to watch the football