It is essential that all these figures ______ twice.

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问题 It is essential that all these figures ______ twice.

选项 A、must be checked
B、be checked
C、is checked
D、will be checked

答案B

解析这是一种虚拟语气。类似的还有“it is important, it is necessary”等。从句用should do的形式，should可以省略。

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