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单选题
Ever since the Smiths moved to the lake area a year ago, they _____ better health.
A
could have enjoyed
B
had enjoyed
C
have been enjoying
D
are enjoying
参考答案
参考解析
解析：
句意：自从史密斯一家一年以前搬到湖区，他们就一直享受着更健康的生活。这里考查现在完成进行时态的用法。根据句意可知，他们一家从那时起一直享受着更健康的生活，因此要用现在完成进行时，表示从过去某时起一直延续到现在。
句意：自从史密斯一家一年以前搬到湖区，他们就一直享受着更健康的生活。这里考查现在完成进行时态的用法。根据句意可知，他们一家从那时起一直享受着更健康的生活，因此要用现在完成进行时，表示从过去某时起一直延续到现在。
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