问题
选择题
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
答案：B
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。