—How long have you known the doctor ? — he helped me three years ago.A．W
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．Because | D．Since |
|
答案
| D |
解析
| 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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