一道英语选择题,自以为聪明的进,the country life he was used to___greatly since19_英语解答

一道英语选择题,自以为聪明的进,
the country life he was used to___greatly since1992 A.changes B.has changed C.change D.have changed

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解答

选B,有since一般用现在完成时,所以排除A,C.而the country life是主语,所以用has