项目经理认为下列哪项活动是项目成功的最大障碍？（）
A.计划
B.时间安排
C.组织
D.人员安排
E.指挥
参考答案：A
Some supermarkets are open _______8 :30 a. m. and 8 :00 p. m. ______ Mid-autumn Day. [ ]
A. at; during
B. between; during
C. between; in
D. about; in
