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The director ordered that the gate and windows( )firmly befo

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The director ordered that the gate and windows( )firmly before leaving the office.
A.shall be closed B.be closed C.ought to be closed D.must be closed
B.be closed 虚拟语气
再问: 为什么要用虚拟语气?c项和D不可以选吗?麻烦解释一下
再答: order 意思是命令,后面的宾语从句要用虚拟语气 should do sth.这里是省略了should。其它选项都不对。