违反我国《拍卖法》的规定，竟买人之间恶意串通给他人造成损害的，除拍卖无效，应当依法承担赔偿责任外，并可由工商行政管理部门对参与恶意串通的竟买人处以最高应价（）的罚款。

A.5%以上10%以下 

B.10%以上30%以下 

C.10%以上50%以下 

D.5%以上30%以下

E-mail, as well as telephones, _____ an important part in daily communication.

A．is playing

B．have played

C．are playing

D．played