—Have they visited the zoo many times.    

 —______________.   Only once.

      A. Yes, they have         B. No, they haven’t        C. No, they have

 

【答案】

：B

【解析】：此題重點考查現(xiàn)在完成時的簡略回答，根據(jù)答語可知應(yīng)用否定性回答。

 

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