AWhile Bremembered mainly Cfor the invention of the telephone, Alexander Graham Bell devoted his life to Dhelp the deaf.

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问题 AWhile Bremembered mainly Cfor the invention of the telephone, Alexander Graham Bell devoted his life to Dhelp the deaf.

选项 A、 
B、 
C、 
D、 

答案D

解析 应改为helping。
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