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It is important that enough time _____A_ to study.

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It is important that enough time _____A_ to study.
A. be given B. will give C. was given D. can be given
请高手讲下,这道题为什么要选A,麻烦把4个选项都详细的讲下,谢谢!我将感激不尽!
这是虚拟语气特殊形式之一:
It is+good(应该的),wrong(不当的),important(重要的),necessary(必须的)+that+主语+should+原形动词,should可以省略.