It was essential that the application forms ______ back before the deadline.A、mu

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问题 It was essential that the application forms ______ back before the deadline.

选项 A、must be sent
B、would be sent
C、be sent
D、were sent

答案 C

解析 与essential,  imperative,  anxious,  vital,  keen,  better,  advisable,  preferable,possible,  appropriate,desirable,eager,insistent,natural,proper,important,necessary,urgent等形容词相关的名词性从句中,谓语要使用动词原形或"should+动词原形”,如:It is very necessary that theory should be
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