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

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

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

试题答案

答案:D