—How long have you known the doctor ?
—         he helped me three years ago.
A．When　B．Before　C．BecauseD．Since
D
考查情景交際和時間狀語從句。“你認(rèn)識那個醫(yī)生多久了？”“自從三年前他幫助我的時候。”since加含一般過去時的句子表示一段時間，主句用現(xiàn)在完成時。本句的完整形式是I have you known the doctor since he helped me three years ago.故選D。
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