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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．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．helping; being |
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