No sooner had he been back at home than he realized his mistake.为什么还用了个"been"?倒装句No sooner had he been back at home than he realized his mistake.为什么用“been"?

题目详情

No sooner had he been back at home than he realized his mistake.为什么还用了个"been"?
倒装句No sooner had he been back at home than he realized his mistake.为什么用“been"?

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答案和解析

back 不是动词,从句缺少谓语动词,故需加be的适当形式,在此也可用come.

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