关于英语虚拟语气.在主语从句的虚拟语气It is surprising/necessary/important/etc.

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关于英语虚拟语气.
在主语从句的虚拟语气It is surprising/necessary/important/etc.that ...中,能不能将主句中的is改成was?
如果可以,从句中的时态是否要发生相应的变化?比如变成should have done之类的?
麻烦给出一些相应的例句.

不能
但可以是：
It is surprising/strange/etc. that 主语+ should do.../ should have done.
It is necessary/ important that 主语+ should do sth （这里不用should have done, 因为是表建议的）

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再问：那麻烦看一下这道题： It was surprising that the exit door _____ blocked when the fire broke out. Fortunately, the firemen broke it by force. Oh, it was really terrible. A. should be B. should have been 选哪个？为什么？这个是虚拟语气吗？
再答： B 或者 was 哦，纠正一下，用过去式也是可以的。不过，表示不理解，常用should
再问：所以你的纠正是指有It was surprising that ... should have done这个结构? 还是指这道题中的从句可以用过去式？
再答：我选B, 因为这是一个已经发生的过去动作。也可以用过去式
再问：那It was surprising that ... should have done这个结构还是错的，是吗？
再答：我都不知道你在说什么了。你看过我的说明了吗？ It was surprising that the exit door 【should have been 】 blocked when the fire broke out. Fortunately, the firemen broke it by force. It was surprising that the exit door 【was】 blocked when the fire broke out. Fortunately, the firemen broke it by force. 我认为这两句都对。

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