In the past three years ,he ____ very hard at maths. A.works B.worked C.has worked Dis workin

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In the past three years ,he ____ very hard at maths. A.works B.worked C.has worked Dis workin
In the past three years ,he ____ very hard at maths. A.works B.worked C.has worked Dis workin

In the past three years ,he ____ very hard at maths. A.works B.worked C.has worked Dis workin
B.worked

b吧

应该选C。在过去的多少时间里,谓语动词用完成时。
如:
He has been away from school during the last few weeks.
过去的几个星期里他没在学校。
In the past few years they have dealt with quite a few international corporations...

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应该选C。在过去的多少时间里,谓语动词用完成时。
如:
He has been away from school during the last few weeks.
过去的几个星期里他没在学校。
In the past few years they have dealt with quite a few international corporations successfully. 在过去的几年中他们已经和好几家跨国公司做成了生意。

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