AMany a problem concerning the agricultural Bproduction Chave been solved Dthis way.

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问题 AMany a problem concerning the agricultural Bproduction Chave been solved Dthis way.

选项 A、 
B、 
C、 
D、 

答案C

解析 应改为has been,many a problem虽然表示复数含义,但谓语要求用单数。
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