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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.
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