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  Bythe1850sNoahWebster’sfirstbookwassellingonemillionc...

  By the 1850s Noah Webster’s first book was selling one million copies a year , ____ it one of the most popular school books ever .

A. make              B. made                C.  making                D.  to make

【回答】

C

知識點:非謂語動詞

題型:選擇題

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