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题目
题型:不详难度:来源:
---How long have you known the doctor ?  
---_________he helped me three years ago.
A.When B.Before C.BecauseD.Since

答案
D               
解析
             
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。         
核心考点
试题【---How long have you known the doctor ?  ---_________he helped me three years ag】;主要考察你对从属连词等知识点的理解。[详细]
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