By the time you receive this letter, I ______ for America.

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问题 By the time you receive this letter, I ______ for America.

选项 A、will leave
B、have left
C、would have left
D、will have left

答案D

解析句子中有by引导的时间状语，谓语时态应该用完成时，此句是将来时间，所以用将来完成时。

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专业英语四级

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