It is imperative that all people here ( ) term papers before 3:00 P.M.
A. hand in
B. handed in
C. have to hand in
D. would hand in
【答案】A。当名词性从句的主句中出现表示“命令、建议、要求、重要性”的词时，从句动词是should+V，should可以省略掉。主句中imperative表示“必要的、重要的”，从句应当是虚拟语气should+V形式，故正确答案是选项A。
