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

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

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

试题答案

D

解析