问题
选择题
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
答案：D
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。
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