---Large quantities of time ______ been spent on the discussion.

---Yes, and most students are now for the requirement that all the students      not take their cell phones into the classroom.

A．is; will

B．has; /

C．are; must

D．have; should

【考点】虚拟语气在同位语从句中的运用

【分析】请登陆后查看

【解答】请登陆后查看