—Excuse me, could you tell me __________?

—In ten minutes.

A．how long the train will leave

B．how soon the plane will arrive

C．when did the train leave

D．when the train left

航空器因故确需偏离指定的航路或者改变飞行高度飞行时，应当首先（）

A.得到机长的允许

B.取得机组的一致同意

C.取得空中交通管制单位的许可