题目

The teacher commanded that all the students ________ the classroom before he returned.A.mustn’t leave B.didn’t leave C.not leave D.wouldn’t leave 答案：【答案】C【解析】考查使用虚拟语气。句意：他命令在他回来之前，所有的学生不得离开教室。谓语动词是command，command作“命令”之意时，后面的宾语从句要用(should)+动词原形，通常should可以省略，本题补充完整是The teacher commanded that all the students should not leave the classroom before he returned.故选C。

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