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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
    考查情景交际和时间状语从句。“你认识那个医生多久了？”“自从三年前他帮助我的时候。”since加含一般过去时的句子表示一段时间，主句用现在完成时。本句的完整形式是I have you known the doctor since he helped me three years ago.故选D。
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