問題詳情
12. The automaker claimed that the production of hybrid cars would significantly reduce the carbon dioxide emissions that have ________ to the greenhouse effect.
(A) assembled
(B) contributed
(C) polluted
(D) established
參考答案
答案：B
難度：適中0.571429
統計：A(0),B(4),C(1),D(1),E(0)