29.在裝卸貨期間內禁止吸煙。
(A)No smoking during loading and unloading.
(B)No smoking on loading and unloading.
(C)No smoking in loading and unloading.
(D)No smoking at loading and unloading.

答案：登入後查看
統計： A(20), B(10), C(10), D(3), E(0) #1201420