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Commercial and recreational fishing ____...

Commercial and recreational fishing _______ population sizes and also made individuals smaller, since big fish _______ and smaller ones thrown back.

A. decreased; kept B. had decreased; are kept

C. has decreased; keep D. has decreased; are kept

 

D 【解析】 考查时态和语态。句意:商业和休闲捕鱼减少了种群规模,也使个体变小,因为大鱼被保留,小鱼被扔回大海。结合句意第一空是现在完成时态;第二空是一般现在时态的被动语态,故答案为D。  
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