辨析As We Know与As We Know It
为as it is/they are known。我们现在把例2的两个从句改写成如下的被动结构。
3. a. Magazines as they are known today began publication around 1882.
b. Magazines, as is known today, began publication around 1882.
解析：a句中的as they are known today即是被动形式的方式状语从句，由于as前面的名词magazines是复数，因而as从句的主
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