问题补充:
So far this year we a rapid rise in food prices by between 10 and 20 percent.
A. experience
B. had experienced
C. experienced
D. have experienced
答案:
A. experience
B. had experienced
C. experienced
(答案→)D. have experienced
解析:考查时态。根据句中时间状语so far到目前为止,故用现在完成时,选D。