You read the product manual before calling the customer service hotline.为什么before后用分词

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You read the product manual before calling the customer service hotline.为什么before后用分词
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You read the product manual before calling the customer service hotline.为什么before后用分词
You read the product manual before calling the customer service hotline.
为什么before后用分词

You read the product manual before calling the customer service hotline.为什么before后用分词
before是介词after也一样

这里before是介词。。。介词后面应该用分词