He manded that the students the classroom before he returned.
A. didn’t leave
B. wouldn’t leave
C. not leave
D. couldn’t leave
网友回答
A. didn’t leave
B. wouldn’t leave
(答案→)C. not leave
D. couldn’t leave
解析：动词mand如果作“要求”解时，后加动词的虚拟语气形式，即should+动词原形。Should可以被省略。故选C。句意：他要求学生们在他回来之前不能离开教室 。