问题
The volunteers __ a lot of help to the community for nearly ten years.
A:offered
B:will offer
C:are offering
D:have offered
B:will offer
C:are offering
D:have offered
正确答案是：
同类题型
There are ________ flowers in the square during the National Day.
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He _____ play the piano since he was young. He is very famous now.