问题
The time he has devoted in the past years _____________ the disabled is now thought to be ________ great value __________ him.
A:to help; of; for
B:to helping; of; to
C:to help; in; of
D:to helping; /; to;
B:to helping; of; to
C:to help; in; of
D:to helping; /; to;
正确答案是：
