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 背景动作原则: 在过去发生两个动作.一个可延续性动作.一个瞬间动作.可延续性动作用过去进行时做为本件事情发生的背景.一个是瞬间动作用一般过去时 I was reading when someone knocked at the door. 【查看更多】

 

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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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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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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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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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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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