句型可以还原成正常语序的句子，也就是说，强调句型中去掉Itbe…that后，句子仍然通顺，意义也依然完整，只是没有那么强调突出。而含主语从句的复合句中的it是指示代词，后面多为系表结构或被动语态。如果去掉Itbe…that，句子就不通顺了。如：Itwasi
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