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:help; to be
C:to helping; to be
D:helping; being
B:help; to be
C:to helping; to be
D:helping; being
正确答案是:
同类题型
no one ____ me, for I can deal with it all bymyself.
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