It was essential that the application forms _______ back before the deadline. [ A、 ]. must be sent [ B、 ]. would be sent [ C、 ]. be sent [ D、 ]. were sent

It was essential that the application forms _______ back before the deadline. [

A、 ]. must be sent [

B、 ]. would be sent [

C、 ]. be sent [

D、 ]. were sent

出自：阿坝师范学院大学英语

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