题目内容
The students _____ busily when Miss Brown went to get a book ____ in the office.
A. had written; left B. were writing; has left
C. had written; had left D. were writing; had left
D
第一个空表示动作正在进行；第二个空表示的动作发生在第一个动作之前。
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题目内容
The students _____ busily when Miss Brown went to get a book ____ in the office.
A. had written; left B. were writing; has left
C. had written; had left D. were writing; had left
D
第一个空表示动作正在进行；第二个空表示的动作发生在第一个动作之前。