Due to the poor economy, most of the employees will put off taking a summer vacation until the domestic economy______.

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问题 Due to the poor economy, most of the employees will put off taking a summer vacation until the domestic economy______.

选项 A、improve
B、had improved
C、will improve
D、has improved

答案D

解析 主句是内容为因为经济不景气大部分职员的夏季休假将会延迟,用的是将来时态,因此从句内容也应为反映until之后、到国内经济得到改善时的将来时态。另外考虑until引导的时间状语从句使用现在/现在完成时来表达将来时态这一点,空格处要填现在完成时has improved。不要选择将来时态will improve,这是错误的。
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