E-mail, as well as the telephone, ___________ an important part in daily communication.

A．is playing

B．have played

C．are playing

D．play

女性，65岁。宫颈癌患者，CT扫描发现双侧髂骨、骶骨、腰椎多发骨质破坏，周边有软组织肿块形成。最可能的诊断是（）

A.骨肉瘤

B.骨巨细胞瘤

C.转移瘤

D.慢性化脓性骨髓炎

E.多发性骨髓瘤