問題詳情
564.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：簡單0.8
統計：A(1),B(28),C(3),D(0),E(0)