問題詳情

19. _____, measles can now be prevented by a vaccine.
(A) Since a serious health hazard
(B) It was once a serious health hazard
(C) That once a serious health hazard
(D) Once a serious health hazard

參考答案

答案：D
難度：適中0.409091
統計：A(6),B(2),C(2),D(9),E(0)