【題目】My grandpa has been enjoying good health ever since he _______ smoking.

A. stops B. stopped

C. has stopped D. had stopped

【答案】B

【解析】分析句子，可知這是一個(gè)由since引導(dǎo)的時(shí)間狀語(yǔ)從句，主句用完成時(shí)，從句用一般過去時(shí)。根據(jù)句意，可知選B。句意：我的爺爺自從戒煙以后身體一直都很好。

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