问题补充:
It was required by the headmaster that all the students at the meeting.
A. should present
B. present
C. attended
D. be present
答案:
A. should present
B. present
C. attended
(答案→)D. be present
解析:考查虚拟语气。require要求,从句用should + v原形的虚拟语气,should可以省略。be present at出席,根据句意选D。