Every possible means _____ to prevent the pollution,but the sky is still not clear.
Every possible means _____ to prevent the pollution,but the sky is still not clear.
A is used B are used C has been used D have been used
A is used B are used C has been used D have been used
英语人气：699 ℃时间：2020-03-27 08:35:50
优质解答
答案为C首先我们看到means（方法）这个词,它是单数和复数的形式一致的.再看Every possible means,每个可能的方法,那当然是单数了.排斥BDC已经被使用了,现在完成时态与后面的but结果相对应,即先后关系.A被使用了.没有...
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