問題詳情
140. Studies showed that the accumulation of carbon dioxide ______ average global temperatures to rise nearly four degrees Fahrenheit by the twenty–first century.
(A) have caused
(B) has caused
(C) have been causing
(D) causing
參考答案
答案：B
難度：適中0.44898
統計：A(11),B(22),C(13),D(2),E(0)
用户評論
【Amy Tsai】評論
accumulation (n.) 積聚；累積；堆積物；積累。