It was essential that the application forms ____back before the deadline.A must be sent B would be sentC be sent D were sent
热心网友
选择C be sent 虚拟语气的考点为：would rather + that从句+一般过去时；It is vital/necessary/important/urgent/imperative/desirable/advisable/natural/essential + that +动词原形；It is time/about time/high time +that + 一般过去时；proposal/suggestion + that +动词原形；lest + that + should +动词原形; if only + that +would + 动词原形
热心网友
选C。