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The past perfective progressive and the past perfective can be used interchangeably in many cases.
The past perfective progressive and the past perfective can be used interchangeably in many cases.
A.正确
B.错误
正确答案：正确
标签：
英语语法
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The past perfective when used to express hypothetical meanings is called the imaginary use of the past perfective.
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In the “finished” use, the present perfective is commonly accompanied by an adverbial expressing duration, but no such accompanying adverbial is present in the “unfinished” use.