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No one _______ the building without the permission of the policeman.
A.is leavingB.will be leavingC.has leftD.is to leave
D

试题分析:考查将来时的表达法。本句中的be to do sth表示计划的事情;或者表示注定要做某事;也可以表示命令做某事,相当于have to, must,should;句意;没有警察的允许没有人可以进入大楼。表示的是一种命令。故D正确。
点评:在英语中将来时有多种表达法。Be to do sth表示计划的事情;或者表示注定要做某事;也可以表示命令做某事,相当于have to, must,should; will表示一般的将来,或者临时决定做某事;be going to do sth表示按照计划安排要做某事;或者根据某种迹象要做某事;be about to do sth即将做某事,不与表示将来时的时间状语连用。现在进行时表示一般将来时,表示按照计划安排要发生的事情,且动词要是一些表示位置变化的动词。
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