Please wait for the doctor until he (be) ______free.

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问题 Please wait for the doctor until he (be) ______free.

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解析这里考查时间状语从句的时态。until，when，as soon as等引导的时间状语从句中用一般现在时代替将来时。例如：As soon as he finishes his work，I will turn on the TV． (当他一完成工作，我就把电视打开了。)

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大学英语三级B级

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