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

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• the students were writing busily when miss Brown went to get a book she ___ in the office.
• the students were writing busily when miss Brown went to get a book she ___ in the office.这句中填had left,为什么不是left呢?
• 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
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