He commanded that all the gates _____when it was getting dark in case thieves came in .   
A．were shutB．must be shutC．could be shutD．be shut
D

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(guān)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(guān)系，用be shut，選D。
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