I finished a very important project ..... two months ago. It was really intense because of the cutting-edge technology we used.

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I finished a very important project ..... two months ago. It was really intense because of the cutting-edge technology we used. (*) on (*) (none) (*) in

This is a companion discussion topic for the original entry at https://english.best/questions/6717,i-finished-a-very-important-project-___-two-months-ago-it-was-really-intense-because-of-the-cutting-edge-technology-we-used/