选哪个,为什么_____the kids have fun,the parents can take photos on

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选哪个,为什么_____the kids have fun,the parents can take photos on the beach.A.when B.while
选哪个,为什么,
_____the kids have fun,the parents can take photos on the beach.
A.when B.while
麻烦具体解释两者的区别

选B
while 一般跟延续性动作,have fun 玩的开心,不是一瞬间的动作.
when一般跟瞬时动作,不是持续性的.比如,i have just sat down,when he arrived.

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