問題詳情

12. Whenever Joe went camping in the mountains, he _____ any water that he got from streamsbefore drinking it.
(A) purifies
(B) may be purifying
(C) would purify
(D) have purified

參考答案

答案：C
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)