President Bush was in Omaha this morning to deliver a speech but he the city by the time

问题补充：

President Bush was in Omaha this morning to deliver a speech, but he the city by the time the shooting took place．

A. left

B. had left

C. had been leaving

D. would have left

答案：

A. left

(答案→)B. had left

C. had been leaving

D. would have left

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