By the time we get to Chicago this evening, we ...

★ Future Perfect vs Future Continuous

By the time we get to Chicago this evening, we _____ (drive) more than four hundred miles. We are going to be exhausted.

A. will have driven

B. will be driving

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When I travel to England next year I ________ (study) English for over four years, so I think I’ll be ready.

A. will be studying

B. will have studied