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辨析As We Know与As We Know It

is known today, magazines began publication around 1882.”也可以将其改为主语从句,说成:“It is known today that magazines began publication around 1882.”
  综上所述,对于as引导的非限制性定语从句,由于as指代主句并且充当从句的主语,此时从句谓语总是使用单数形式,因此被动语态都写成as is known。对于as引导的方式
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