29. 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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29. 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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