He failed in the exam not only        his laziness but also        he didn’t listen to the teacher.

A．because; for

B．because of; because

C．as; for

D．for; since

下列各选项中，不属于《招标投标法》的基本原则的是( )。

A．公开原则

B．公平原则

C．公正原则

D．透明原则