【单选题】【消耗次数：1】
The rescue team must have searched for the missing visitors
two days ago, _____?
①
mustn’ t they
②
haven’ t they
③
didn’ t they
④
hadn’ t they
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【判断题】
多数情况下，人们将管理活动分为高、中、基三个层次，即战略计划层、管理控制层和执行控制层。针对这三个层次所建设的系统称为战略计划子系统、管理控制子系统、执行控制子系统。
①
正确
②
错误