Ever since the Smiths moved to the lake area a year ago, they ______ better health.

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问题 Ever since the Smiths moved to the lake area a year ago, they ______ better health.

选项 A、could have enjoyed
B、had enjoyed
C、have been enjoying
D、are enjoying

答案C

解析 现在完成进行时。since表示从那时起,后面接现在完成进行时,表示从过去某时起一直延续到现在。
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