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  3. A Many a problem concerning the agricultural B production C have been solved D this way.

A Many a problem concerning the agricultural B production C have been solved D this way.

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问题 A Many a problem concerning the agricultural B production C have been solved D this 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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