before doing和before to do

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before doing和before to do
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before doing和before to do
before doing和before to do

before doing和before to do
before 一般做介词和连词用.做介词时后面跟名词动名词;做连词时后面跟句子,似乎没有楼主说的before to do.楼主有完整的句子吗?