英语语法：as is known to all填空
前面我们学习了英语语法：all his life填空、from all over the world填空、as above填空、as a matter of fact填空
专项训练二 完成句子
48. _________, raw material prices have been rising.
众所周知，原材料的价格一直在上涨。
48. As is known to all众所周知
结构分析：
As is known to all是as引导的定语从句，as在从句中作主语，raw material prices是主语（raw material是前置定语），have been rising是现在完成进行时。
49. Why didn’t you go to work _________today?
你今天为什么不像平常那样去上班?
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