By the time I reach the top of the mountain, I______(已上气不接下气).

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问题 By the time I reach the top of the mountain, I______(已上气不接下气).

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答案will have been out of breath

解析 ①by the time引导时间状语从句时,从句为一般现在时,主句应用将来完成时,即win have done结构。②“上气不接下气”可用out of breath表达。
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