下列哪种疗法可以用于酒精依赖或者药物成瘾的治疗（）

A、代币调节法

B、厌恶疗法

C、冲击疗法

D、系统脱敏法

—I came to your office yesterday morning, but nobody was in.

—Oh, we ________ a meeting in the meeting room. [ ]

A. have had

B. had

C. were having

D. had had