患者胃脘刺痛，痛有定处而拒按，食后痛甚，舌质紫暗，脉涩。其证候是（）

A.气机阻滞

B.食积气阻

C.瘀血停滞

D.血瘀血虚

E.气虚血瘀

I ________ have used the computer without asking you first. [ ]

A. mustn't      

B. needn't      

C. shouldn't      

D. can't