—Did you attend the opening ceremony of The Voice of China last week?

—Sorry! We ________ it, but we had a terrible traffic accident on our way.

A．must have attended

B．must attend

C．could have attended

D．could attend

某纺织厂一个车间，开动100台织布机，规定每人看管12台，出勤率95％，三班运转，则该工种定员人数为（）。

A、26人

B、27人

C、28人

D、29人