—I sent him the dictionary by mail this morning.

—You ______ that, for he's coming tomorrow morning.[ ]

A. needn't have done  

B. didn't have to do  

C. needn't do        

D. mustn't do

单纯性粘连性肠梗阻的手术指征是（）。

A.手术后早期粘连梗阻

B.非手术治疗不见好转者

C.单纯性粘连肠梗阻，肠音亢进

D.粘连性不完全性肠梗阻

E.广泛粘连性不完全性肠梗阻