I was about to tell him the secret    __someone patted me on the shoulder.

A．as

B．until

C．while

D．when

—个栈的初始状态为空。现将元素1、2、3、4、5、A、B、C、D、E依次入栈，然后再依次出栈则元素出栈的顺序______。

A．12345ABCDE

B．EDCBA54321

C．ABCDE12345

D．54321EDCBA