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一个英语句子11.________ with his office work,he had no time to att

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一个英语句子
11.________ with his office work,he had no time to attend to his sick daughter.
A.Keeping occupying .Kept occupied
C.Keeping occupy D.Keeping to occupy
为什么选B呀
不是有Be occupied with sth.那这里的be哪去了.
一个英语句子11.________ with his office work,he had no time to att
keep sb occupied with sth 集中注意力
这里occupied是adj.
be和keep后都可以加adj.
keep有时候可以和be互换
be强调的是一种现有的状态,与前后的状态没联系
而keep有从之前就是这样,现在继续之前的状态,并且有继续保持下去的趋势
因此没有be