問題詳情

19. While there are over 300 million carriers of hepatitis B virus worldwide, _______ are unaware that they arecarriers.
(A) most of it
(B) most of them
(C) most of which
(D) most of whom

參考答案

答案：B
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)