Ever since the family moved to the suburbs last year, they could have enjoyed better health.

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问题 Ever since the family moved to the suburbs last year, they could have enjoyed better health.

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答案could一/

解析 此句意为“自从他们去年搬到郊区后,他们身体状况更好了”,句中无需使用could have done表示“本可以……”,可以直接使用完成时。
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