1. 用于It is advisable/ odd/ desirable/ imperative/ natural/ natural/ necessary/ strange/ unusual, etc. + that 引导的主语从句中。
It is highly desirable that a new president (should) be appointed for the college.
2. 用于It is desired, it is suggested, etc. +that 引导的主语从句中。
It is urged that he(should) be trained.
It is requested that Mr.Wang(should)give a performance at the party.
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