My grandpa has been enjoying good health ever since he（ ）smoking.
A、
stops
B、
stopped
C、
has stopped
D、
had stopped
【正确答案】：B
【题目解析】：
本题考查一般过去时的判断与使用。
主句时态为现在完成时，since后接的从句应使用一般过去时，B选项符合题意。
句意：自从我的爷爷戒烟后，他一直很健康。
My grandpa has been enjoying good health ever since he（ ）smoking.
My grandpa has been enjoying good health ever since he（ ）smoking.
stops
stopped
has stopped
had stopped
本题考查一般过去时的判断与使用。
主句时态为现在完成时，since后接的从句应使用一般过去时，B选项符合题意。
句意：自从我的爷爷戒烟后，他一直很健康。