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。