题目内容
He commanded that all the gates _____when it was getting dark in case thieves came in .
| A．were shut | B．must be shut | C．could be shut | D．be shut |
D
解析试题分析：考查虚拟语气：句意：他命令所有的门天黑的时候要关闭，以防小偷进来。主句的谓语是command，宾语从句的谓语是虚拟语气，谓语是should do，should可以省略，因为the gates和shut是被动关系，用be shut，选D。
考点：考查虚拟语气
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