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The past perfective progressive is made up of had been + -ing participle.
The past perfective progressive is made up of had been + -ing participle.
A.正确
B.错误
正确答案：正确
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英语语法
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What is the tense and aspect of the following sentence?I was sitting in the classroom.
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Aspect and tense belong to two separate categories, but they are often used in combination.