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英语问题.It was essential that all the necessary documents _____

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英语问题.
It was essential that all the necessary documents ________ to the president’s office being the end of this month.
A) be handed in B) must be handed in
C) should hand in D) had been handed in
A
不明白的再问哟,请及时采纳,多谢!
再问: 。。。原因呢。。。答案我知道
再答: it is /was essential that +从句,从句应该是should +动词原形,因从句的主语是documents,要用被动语态。另外should 是可省略的。