No one this building without the permission of the police . A is leaving B is to leave C

发布时间：2020-08-16 22:43:17

No one      this building without the permission of the police .
A is leaving       B is to leave         C has left           D will be leaving

网友回答

解析：考察be to do 用法。Be to do用于否定句，表示“禁止”，相当于mustn’t。结合句意可知B正确。句意：没有警察的允许，任何人都不得离开大楼。
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