阿摩線上測驗
39. The coast guard placed a navigation ________ near the dangerous reef area to warn passing vessels.
(A) buoy
(B) bounty
(C) band
(D) boy
答案：登入後查看
統計： A(0), B(0), C(1), D(0), E(0) #3930872
統計： A(0), B(0), C(1), D(0), E(0) #3930872
