Hearing his words，I couldn’t decide ______or remain.

A．whether to go abroad

B．if I go abroad

C．if to go abroad

D．to go abroad

人工关节置换术后最常见并发症是

A．泌尿性感染

B．骨折

C．膀胱损伤

D．急性肾功能衰竭

E．胃肠道出血