It is proper ... that ...
结构︰It is+意志形容词(important 等)+(that)+主语+(should)+原形动词
说明︰意志<形容词>包括 important,necessary,imperative,essential,urgent,desirable, advisable,recommendable,proper 等。that-<子句>中只能用<助动词> should,不可用 must,而 should 往往予以省略。
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