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

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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