I think this is the most interesting thing _____ has happened to us .

A．that

B．which

C．what

D．who

胃大部切除术后，碱性反流性胃炎可有

A．右上腹突发剧痛，局部有腹膜刺激征
B．上腹饱胀，呕吐食物和胆汁
C．上腹部突发剧痛，频繁呕吐，不含胆汁
D．进食后心悸、出汗、恶心、腹泻
E．剑突下持续烧灼痛，进食后加重，抗酸剂无效