問題詳情

【題組】21.( ) Only a small percentage of water in these areas ______ drinkable.
(A) has
(B) were
(C) are
(D) is

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)