32. The issue of rising sea level ____ worldwide since 1993. (A) is discussed (B) have been discusse

問題詳情

32. The issue of rising sea level ____ worldwide since 1993.
(A) is discussed
(B) have been discussed
(C) has been discussed
(D) has discussed

答案：D
難度：困難0.25
統計：A(3),B(3),C(2),D(4),E(0)