该图所显示的病例为（）。

A.二尖瓣腱索断裂

B.二尖瓣脱垂

C.二尖瓣赘生物

D.风心二尖瓣狭窄

E.黏液瘤

You know he is not going to let us leave early if we ___ get the work done. [ ]

A. can't

B. may not

C. shouldn't

D. mustn't