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

答案:In the past three years 意思是在过去的三年里 既表总结意思就是说在这三年他所做的事情,很明显现在完成时表示这三年里他已经做过的事情!所以选C咯!

C

选B

因为事情发生在过去，用过去时~

选C。由In the past three years 可知本句要用现在完成时。