Nowscientistsare_________tosolv

发布时间:2020-07-27 19:04:25

Now scientists are _________ to solve the problem about river pollution.A.making an attemptB.made attemptC.made a lot of attemptD.attempted

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A解析从句子结构和语态分析来看B、C、D三项均与are构成被动语态,但与句意不符。
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