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