the student ____(write)busily when Miss Brown went to get a book she____(leave)in the offic

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the student ____(write)busily when Miss Brown went to get a book she____(leave)in the offic
the student ____(write)busily when Miss Brown went to get a book she____(leave)in the offic

the student ____(write)busily when Miss Brown went to get a book she____(leave)in the offic
was writing
left

答案是was writing, had left, 100%正确