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问题: 英语问题

i 'd been caught up ( )responsibilities
为什么填“in”不填“by”

解答:

I'd been caught up ( )responsibilities
个人意见:有错则改之,无则加勉。
之所以用介词in是因为介词短语in responsibilities出于责任。
by被省略了,因为对于后面无对象的短语介词省略。

I'd been caught up ( by somebody or something in)responsibilities