By the time he arrives in Beijing, we______here for two days.

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问题 By the time he arrives in Beijing, we______here for two days.

选项 A、have been staying
B、have stayed
C、shall stay
D、will have stayed

答案D

解析 by the time常用于引导时间状语从句,其主句一般要用完成时。因从句中谓语动词为一般现在时,其主句的谓语要用将来完成时。
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