42. We appreciate your patience and please _____ that we will do everything in our power to _____ th at this type of error does not occur in the future.
(A)be assured....ensure
(B)be assured....be ensured
(C)assure.....be ensured
(D)assure....ensure。

答案：登入後查看
統計： A(7), B(0), C(2), D(2), E(0) #2664927