We started to do our homework 3 hours ago.(for 3 hours) We____ ____ our homework for 3 hours.

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We started to do our homework 3 hours ago.(for 3 hours) We____ ____ our homework for 3 hours.
We started to do our homework 3 hours ago.(for 3 hours) We____ ____ our homework for 3 hours.

We started to do our homework 3 hours ago.(for 3 hours) We____ ____ our homework for 3 hours.
have done