作人称代词，指示代词。
是代词，在用作人称代词时指代前文提过的某事。
"It" is a pronoun. As a personal pronoun it refers back to something that has already been mentioned.
是代词，在用作人称代词时指代前文提过的某事。
"It" is a pronoun. As a personal pronoun it refers back to something that has already been mentioned.
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