—How long have you known the doctor ? —he helped me three years ago.A.WhenB.BeforeC.BecauseD.Since-九

题目简介

—How long have you known the doctor ? —he helped me three years ago.A.WhenB.BeforeC.BecauseD.Since-九

题目详情

—How long have you known the doctor ?
—         he helped me three years ago.
A.When B.Before C.BecauseD.Since
题型:单选题难度:中档来源:不详

答案

D
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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