问题

The time he has devoted in the past ten years ________ the disabled is now considered ________ of great value.
A:to help;being
B:to helping;to be
C:to help;to be
D:helping;being
B:to helping;to be
C:to help;to be
D:helping;being
正确答案是:
同类题型
There was such a long queue for coffee at the intervals that we __________ have to give up
different figure ________ eachtime I add them, you see.—-Something must be wrong with thecalculator.
Who _______ rock music to country music two years ago.
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The light in the office is still on.—–Oh, I forget to _____.