問題詳情
21. Because industry and human activities are producing enormous amounts of gases,the Earth is experiencing something _____ as the greenhouse effect.
(A) known
(B) knowing
(C) being known
(D) to know
參考答案
答案：A
難度：簡單0.747748
統計：A(83),B(3),C(20),D(1),E(0)
用户評論
【伶】評論
Because industry and human activities are producing enormous amounts of gases, the Earth is experiencing something _____ as the greenhouse effect.