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
The past perfective progressive and the past perfective can be used interchangeably in many cases.
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In the “finished” use, the present perfective is commonly accompanied by an adverbial expressing duration, but no such accompany
The hypothetical past refers not to a fact but to a non-fact.
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- The “（）” use of the present perfective denotes that an action or state extends over a period lasting up to the present moment, p
- The past perfective when used to express hypothetical meanings is called the imaginary use of the past perfective.
- The function of auxiliary “（）” is to help the main verb to form the perfective or the perfective progressive aspect.
- The past perfective progressive is made up of had been + -ing participle.