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Every possible means to prevent the air pollution.but the sky is still not very

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Every possible means to prevent the air pollution.but the sky is still not very

Every possible means ________ to prevent the air pollution，but the sky is still not very clear.

A．were using B．have used  
C．has been used D．was used 

试题答案

C

解析

标签：pollutionairbutissky

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