— Jenny how many years have you studied in China?— I here for three years by the end of

问题补充：

— 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

答案：

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。