The time he has devoted in the past years _______ the disabled is now considered ________ of great value.
A.to help; being | B.to helping; to be | C.to help; to be | D.to helping; being |
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The time he has devoted in the past years _______ the disabled is now considered ________ of great value.
A.to help; being | B.to helping; to be | C.to help; to be | D.to helping; being |