問題詳情

21.We must _______ to clean up beaches, or it’ll be too late to protect sea life.
(A)be gone
(B) beat the clock
(C) be in serious trouble
(D) make a clear point

參考答案

答案：B
難度：適中0.428571
統計：A(2),B(6),C(0),D(3),E(0)