The students busily when Miss Brown went to get a book she in the office.A．had written ; leftB．were writing ;has left C．had written ;had leftD．were writing ;had left 题目和参考答案——青夏教育精英家教网—

题目内容

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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