— Why weren't you at the meeting?

　　　　— I ________ for a long distance call from my sister in America.

A．was waited

B．was waiting

C．has waited

D．have been waiting

汽车上使用的膜片弹簧离合器，主要是由（）等组成的。

A.从动盘

B.中压盘

C.飞轮

D.膜片弹簧

E.分离轴承