-Bad luck! It's too late.

-It doesn't matter. The movie _______ for only a few minutes. You can't miss it.

A．has begun

B．has been on

C．began

D．was on

常用除热原的方法有（）

A.活性炭吸附

B.反渗透法

C.电渗析法

D.高温法

E.多次蒸馏法