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19．As is known to us is that English is being accepted as an international language．As---What．

分析我們都知道的是，英語被認為是一種國際語言．

解答答案．As---What．考查主語從句．引導主語從句is known to us，做從句做從句的主語，用What，表示"我們都知道的"．As引導非限制性定語從句，所以用它應該是As is known to us，English is being accepted as an international language．

點評考查句子改錯．
本句子還可以用It is known to us that English is being accepted as an international language．這個句子里It做形式主語，代指主語從句 that English is being accepted as an international language．

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