【题目】My grandpa has been enjoying good health ever since he _______ smoking.
A. stops B. stopped
C. has stopped D. had stopped
在线课程【答案】B
【解析】分析句子，可知这是一个由since引导的时间状语从句，主句用完成时，从句用一般过去时。根据句意，可知选B。句意：我的爷爷自从戒烟以后身体一直都很好。
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