阿摩線上測驗
37. A: Why are the children so quiet?
B: That’s strange. They must _____ something.
(A) be happy about
(B) be up to
(C) be away in
(D) be down under
答案：登入後查看
統計： A(2), B(11), C(3), D(11), E(0) #3487975
統計： A(2), B(11), C(3), D(11), E(0) #3487975
