John and I＿＿friends for eight years. We first got to know each other at a Christmas   party. But we＿＿ each other a couple of times before that.

A．had been； have met

B．have been； have met

C．had been； had met

D．have been； had met

不宜与半夏同用的药物是

A．官桂
B．甘草
C．人参
D．附子