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had用于什么时态

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had用于什么时态
had用于什么时态
可以用于过去时,此时是动词,如 I had my dinner at 8.p.m. alone in the cafeteria.
再就是作为非谓语,可以是过去完成时had done,如 I had lost my book.
过去完成进行时had been doing如 I had been playing football since 7 years old.