Students in Beijing away many books to the Hope Schools since .A. have givenB. giveC.

问题补充：

Students in Beijing away many books to the Hope Schools since .

A. have given

B. give

C. will give

D. gave

答案：

(答案→)A. have given

B. give

C. will give

D. gave

解析：根据时间状语,从，可知本句为现在完成时态，所以选A.