题目

—Did you see who the driver was?  —No, so quickly_________ that I couldn’t get a good look at his face.     A.does the car speed by             B.the car sped by     C.did the car speed by             D.the car speeds by   答案:C若tanα=3,,则tan(α﹣β)等于(  )A.﹣3 B. C.3 D. 
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