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The students _______ busily when Miss Brown went to get a book she _______ in the office. 

A. had written, left                                  B. were writing, has left

C. had written, had left                            D. were writing, had left

 

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On the street I saw a studen _____ I thought was English.

  A. whom   B. who

  C. the one   D. he

 

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