—Brain, did you have a good time during the holiday?

— ______. I had to do homework most of the time.

A．No doubt

B．Why not

C．Forget it

D．Not really

下列能引起催化剂预接触罐压力过高的因素有（）。

A、预接触罐出料线堵塞

B、预接触罐出料线手阀关闭

C、丙烯反串到预接触罐

D、预接触罐温度升高