阿摩線上測驗
24. While it is hard to decide _____ vitamin supplements make users healthier, it is much easier to challenge the idea that more is better.
(A) since
(B) whereas
(C) although
(D) whether
答案：登入後查看
統計： A(16), B(32), C(20), D(315), E(0) #1825240
統計： A(16), B(32), C(20), D(315), E(0) #1825240
