I don't think we'll ever finish. At 8 o'clock, we ...

★ Future Perfect Continuous

I don’t think we’ll ever finish. At 8 o’clock, we ____ (work) for 12 hours and there is still a lot to do!

A. Will have been worked

B. will had been working

C. will have been working

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In half an hour she (work) for six hours without a break.

A. will have been working

B. will had been working

C. will not have been work