阿摩線上測驗
27. It is dangerous ____ your seatbelt fastened during the
entire flight.
(A)to keep
(B)that keeping
(C)not to keep
(D)to not
keeping
答案：登入後查看
統計： A(19), B(17), C(77), D(26), E(0) #3287576
統計： A(19), B(17), C(77), D(26), E(0) #3287576
