A. presented B. preserved C. prepared D. proclaimed
A. from B. of C. in D. on
A. products B. alternations C. things D. alterations
A. 组织 B. 计划 C. 协调 D. 激励
A. 恰当的地点 B. 恰当的时间 C. 恰当的顾客 D. 恰当的成本