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

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

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

答案 C

解析 本题中有形容词essential,它后面的状语从句要用should+动词原形构成的虚拟语气,类似的形容词还有;important,necessary,natural,urgent, essential,appropriate,vital advisable,possible,pitiful, funny,concerned,ridiculous,anxious,unthinkable等。
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