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