---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(dāng)。時(shí)候；B 在之前；C 因?yàn)镈 自從。句意 你認(rèn)識(shí)這個(gè)醫(yī)生多久了。自己三年前他幫我開(kāi)始。上文提到現(xiàn)在完成，與since引導(dǎo)的一般過(guò)去時(shí)相呼應(yīng)。故選D項(xiàng)。         
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