When I met him last weekend, it was the first time we ______ each other since we were at school. 

A．saw

B．have seen

C．were seeing

D．had seen

生后20天婴儿，吃奶后呕吐5天，进行性加重，呕吐呈喷射样，呕吐物不含胆汁，味酸臭。查体：于剑突下偏右处可触及橄榄形肿块，该患儿的初步诊断为（）

A.幽门痉挛

B.先天性肥厚性幽门狭窄

C.胃扭转

D.胃食管反流

E.贲门痉挛