碱洗塔出口H2S严重超标时，应做的处理是（）。

A．分离岗位紧急停车

B．压缩岗位紧急停车

C．碳二加氢反应器切换

D．冷箱加注甲醇

—How you've changed! You _____ very short.

—But I am not sure if I am taller than you now. [ ]

A. are sure to be

B. use to be

C. are

D. used to be