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
英語人氣：283 ℃時(shí)間：2020-03-27 08:35:50
優(yōu)質(zhì)解答
答案為C首先我們看到means（方法）這個(gè)詞,它是單數(shù)和復(fù)數(shù)的形式一致的.再看Every possible means,每個(gè)可能的方法,那當(dāng)然是單數(shù)了.排斥BDC已經(jīng)被使用了,現(xiàn)在完成時(shí)態(tài)與后面的but結(jié)果相對(duì)應(yīng),即先后關(guān)系.A被使用了.沒有...
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