阿摩線上測驗
32. ATTENTION. All vessels near BOSTON harbor must keep ___________ this area in order to search and rescue progress.
(A) clearance of
(B) clearance on
(C) clear into
(D) clear of
答案：登入後查看
統計： A(1), B(2), C(4), D(3), E(0) #4055660
統計： A(1), B(2), C(4), D(3), E(0) #4055660
