问题补充:
The volunteers a lot of help to the community for nearly ten years.
A. offered
B. will offer
C. are offering
D. have offered
答案:
A. offered
B. will offer
C. are offering
(答案→)D. have offered
解析:本题难度适中,考查现在完成时,由for nearly ten years.可知是用现在完成时,选D答案。