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lastyear [一般过去时]Iworkedv

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　　[一般过去时] :

　　I worked very hard last year.

　　[现在完成时] :

　　I have worked hard since last year.

　　[过去进行时] :

　　I was working very hard this time last year.

　　[过去完成时] :

　　I had worked hard last year so I got good marks at the end of the year.

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