If there's no context at all, I think the correct answer should be A. ). The best way to describe a past completed action is with the simple past (was).
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LiveinjapanQ: Why are your hands so dirty? - I __ in the garden.
A. was working
B. have been working
The test says B is correct, is A wrong (technically some words (e.g 10 minutes ago) may be needed)?
CalifJim, if the speaker was thinking in terms of a work session in the garden which is now finished, was working would be appropriate; if he was thinking in terms of a work session in the garden which is just now finishing (or which represents a pause in the gardening, to be resumed later), have been working would be appropriate.Understand!