预算定额的编制应遵循( )原则。
A．统一性和差别性相结合
B．平均先进性
C．独立自主
D．以专家为主
参考答案：A
— 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. are having
为什么说《药》含有双重的悲剧性？
