waste time/money ( ) doing sth.介词到底用in 还是 on Don't waste time on watching TV.Don't waste time in watching TV.到底哪个对呀?

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waste time/money ( ) doing sth.介词到底用in 还是 on
Don't waste time on watching TV.
Don't waste time in watching TV.
到底哪个对呀?

用in.这是习惯用法没什么理由,一般都说
waste time in doing sth./ waste time on sth.