—Can I help you? 

—______. I want a pair of shoes for my son.[ ]

A. Yes, please    

B. No, you can't

C. Yes, you can.  

D. Sorry, you can't.

腹股沟疝修补术后复发较常见的因素包括（）

A.遗留内环太大

B.疝囊游离和切除不够，未做到真正的高位结扎

C.腹横筋膜或腹横肌腱膜弓缝合失误

D.血肿形成或感染

E.以上都是