Now scientists are _________ to solve the problem about river pollution.
- A.
making an attempt
- B.
made attempt
- C.
made a lot of attempt
- D.
attempted
A
從句子結(jié)構(gòu)和語(yǔ)態(tài)分析來(lái)看B、C、D三項(xiàng)均與are構(gòu)成被動(dòng)語(yǔ)態(tài),但與句意不符。
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