By the year 2170, people _____ cities and industries on Mars.

A. establish
B. established
C. will have established
D. have established
C
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科目：高中英語 來源：0109 期末題 題型：單選題

By the year 2170, people _____ cities and industries on Mars.
[     ]
A. establish
B. established
C. will have established
D. have established

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