问题
选择题
He commanded that the students ______the classroom before he returned.
A．didn’t leave
B．wouldn’t leave
C．not leave
D．couldn’t leave
答案
答案：C
题目分析：动词command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 。