It's the third time__ I have been there 为什么要用that

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It's the third time__ I have been there 为什么要用that
是强调句吗 帮我分析一下成分啊什么的 我知道有这么个it's 序数词 time that...固定搭配 我希望成分帮我分析一下

it's time that...固定句式