问题补充:
The professor requested that all the students the reports at once.
A. would hand in
B. hand in
C. handed in
D. handing in
答案:
A. would hand in
(答案→)B. hand in
C. handed in
D. handing in
解析:考查虚拟语气:动词request,require,suggest,advise,command等,后面接宾语从句,从句的谓语用(should)do,句意是:教授要求所有的学生立刻教报告。选B。