2. 专升本
  3. It was essential that all the necessary documents ______ to the president’ s office before the end of this month.

It was essential that all the necessary documents ______ to the president’ s office before the end of this month.

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问题 It was essential that all the necessary documents ______ to the president’ s office before the end of this month.
选项 A、be handed in
B、must be handed in
C、should hand in
D、had been handed in
答案A
解析
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