Now scientists are _________ to solve the problem about river pollution.


  1. A.
    making an attempt
  2. B.
    made attempt
  3. C.
    made a lot of attempt
  4. D.
    attempted
A
從句子結(jié)構(gòu)和語態(tài)分析來看B、C、D三項均與are構(gòu)成被動語態(tài),但與句意不符。
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