阿摩線上測驗
25. Having a close, happy friend can raise a person’s mood by nine percent, ______ each unhappy friend lowers
it by seven percent.
(A)while
(B) with
(C) so
(D)since
答案：登入後查看
統計： A(71), B(17), C(2), D(5), E(0) #934333
統計： A(71), B(17), C(2), D(5), E(0) #934333
