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"You seem totally worn out." "Yes, I non-stop all day." A. have been working B.

"You seem totally worn out." "Yes, I non-stop all day." A. have been working B. was working C. have worked D. worked

The correct answer is:

A. have been working

The sentence implies an ongoing action that has been happening throughout the day and is connected to the present moment. "Have been working" correctly conveys that sense of continuous action leading up to now.

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