Li Lei often ____ Lin Tao ____ his English.

A．help; to

B．helps; with

C．helps; to

D．help; with

CT检查在骨肿瘤诊断中的主要作用是()

A．显示软组织肿块

B．早期发现

C．发现转移病灶

D．更好地显示骨内破坏的范围

E．确定肿瘤的性质