单选题 Even since the family moved to the suburbs last year, they ______ better health.
A. could have enjoyed B. have been enjoying
C. had enjoyed D. are enjoying

【正确答案】 B
【答案解析】该题考查现在完成时的用法。since：表示“自从”时引导的时间状语从句，主旬要用现在完成时。所以B项是正确答案。