問題詳情

21. Many ways ______ to stop the fire for two hours.
(A) have tried  
(B) has stopped 
(C) will try 
(D) have been tried

參考答案

答案:[無官方正解]
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)

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