You were stupid to try climbing up there. You yourself.A. can killB. might have killedC.

问题补充：

You were stupid to try climbing up there. You yourself.

A. can kill

B. might have killed

C. might kill

D. must have killed

答案：

A. can kill

(答案→)B. might have killed

C. might kill

D. must have killed

解析：考察情态动词用法。本句中前句中的were说明本句叙述的是过去的事情，故使用“情态动词+have done”表示对过去的虚拟或者推测。排除AC项。Might have done也许做了某事；must have done一定做了某事；句意：你想爬到那里真是太愚蠢了。你也许会伤到自己的。故B正确。