40. Most airline companies request that every passenger _____ his or her cellphone before takeoff.
(A) turn off
(B) turns off
(C) to turn off
(D) turning off
答案:登入後查看
統計: A(264), B(101), C(83), D(41), E(0) #3154141
統計: A(264), B(101), C(83), D(41), E(0) #3154141