My niece has been to Sumatra and Iran as well as all of Europe. By the time she’

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问题 My niece has been to Sumatra and Iran as well as all of Europe. By the time she’s twenty, she _________ ahnost every where.

选项 A、will be
B、would have been
C、will have been
D、would be

答案 C

解析将来完成时必须与一个表示未来确切时间的某一点进行比较。也可以表示一个动作在另一个未来的动作发生之前业已完成。by the time常常用来引起将来完成时。因此C为正确选项。

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