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    精英家教网 > 初中英语 > 题目详情
    ---How long have you known the doctor ?  
    ---_________he helped me three years ago.
    A．When　B．Before　C．BecauseD．Since
    D               
                 
    试题分析： 考查连词辨析。A 当。时候；B 在之前；C 因为D 自从。句意 你认识这个医生多久了。自己三年前他帮我开始。上文提到现在完成，与since引导的一般过去时相呼应。故选D项。         
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