19. While there are over 300 million carriers of hepatitis B virus worldwide, _______ are unaware that they are
carriers.
(A) most of it
(B) most of them
(C) most of which
(D) most of whom
答案:登入後查看
統計: A(2), B(75), C(31), D(27), E(0) #1772756
統計: A(2), B(75), C(31), D(27), E(0) #1772756