---How long have you known the doctor ?  
---_________he helped me three years ago.
A．When　B．Before　C．BecauseD．Since
D               
             
試題分析： 考查連詞辨析。A 當。時候；B 在之前；C 因為D 自從。句意 你認識這個醫(yī)生多久了。自己三年前他幫我開始。上文提到現(xiàn)在完成，與since引導(dǎo)的一般過去時相呼應(yīng)。故選D項。         
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