— Jenny, how many years have you studied in China?
— I here for three years by the end of this month.
A. study
B. have studied
C. will have studied
D. am studying
网友回答
A. study
B. have studied
(答案→)C. will have studied
D. am studying
解析：考查时态。by意为：到…为止；引导的从句做状语时，主句必须使用完成时. the end of this month是表示将来的时间。所以这里使用将来完成时。