--- I had thought he would be nervous in this speech competition, but he turned out to be calm.

--- He        quite enough preparation for it.

A．should do

B．must do

C．should have done

D．must have done

下列哪项叙述不符合早期脑结核瘤的CT表现（）

A.病灶周围水肿

B.多位于幕上

C.病灶形态不规则

D.平扫不易显示病灶本身

E.病灶不强化