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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