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

解析試題分析：考查虛擬語氣：句意：他命令所有的門天黑的時候要關閉，以防小偷進來。主句的謂語是command，賓語從句的謂語是虛擬語氣，謂語是should do，should可以省略，因為the gates和shut是被動關系，用be shut，選D。
考點：考查虛擬語氣

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