摘要： 代替有生命但不能或不必分阴阳性的东西.例如: The baby cried because it was hungry. Someone is knocking at the door, who can it be? (二)用作强调句.构成强调结构 句型结构:It is(was)+强调部分+that.例如: It was last night that they left for H.K. It was I that(who) his sister in the park yesterday.

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