题目内容
( A ) 16. What were you doing when we were working
on the farm yesterday afternoon? I____
the house.
A. was cleaning B. have cleaned
C. will clean D. clean
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题目内容
( A ) 16. What were you doing when we were working
on the farm yesterday afternoon? I____
the house.
A. was cleaning B. have cleaned
C. will clean D. clean