阿摩線上測驗
3. The visitor looks very suspicious hanging around by the bins. Let's keep a ______ eye on him.
(A) vigilant
(B) violent
(C) vulnerable
(D) voluntary
答案：登入後查看
統計： A(6), B(0), C(2), D(0), E(0) #3257495
統計： A(6), B(0), C(2), D(0), E(0) #3257495
