英语语法单选题--- Why do you look so upset?--- _,I had to take over

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英语语法单选题
--- Why do you look so upset?--- _,I had to take over his work.
A.His being away B.He was away C.He had been away D.He being away
在这如何解释为什么不能选A

选A.
--- Why do you look so upset?
--- His being away ,I had to take over his work.
你为什么看起来那么沮丧
他走了,我必须接管他的工作
解析：这里是独立主格的结构,his 是being away的逻辑主语,做原因状语从句.
相当于：Because he was away,I had to take over his work
祝开心~!
再问：我也是选A 的但是参考答案是D 是这么解释的答语中逗号前的部分是独立主格结构在句中充当状语相当 because he was away 这是啥原因啊谢谢
再答：哦，对不起，我不小心把动名词的逻辑主语和独立主格的逻辑主语搞混了。动名词的逻辑主语用形容词性物主代词，然后连同它一起充当一个名词的作用，所以不能选A，因为名词不可以独立成句，懂吗？而独立主格的逻辑主语，只要就用代词或者名词的的原型就行了，然后加分词，构成独立结构，充当各种状语的作用。我的解释其实和你的答案是一样的，独立主格在这里相当于原因状语从句。Because he was away, I had to take over his work

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