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.
A.正确
B.错误
正确答案：错误
In the “finished” use, the present perfective is commonly accompanied by an adverbial expressing duration, but no such accompany
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In the sentence He worked as a teacher all his life., the simple past indicate a past habit.
The past perfective progressive and the past perfective can be used interchangeably in many cases.
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