这个句子真正的主语是“that all staff in this company (should) leave before 9 p.m.”,其为It is+过去分词+that型主语从句,这里的形容词 …
英语老师. 1. It is +adj.+that 从句. It is important that...重要的是...... It is necessary that...必要的是...... It is likely that...很可 …
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