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--- I _______ so busily recently that I ______ no time to help you with your maths. ---That’s OK. I ...
题目内容：
--- I _______ so busily recently that I ______ no time to help you with your maths.
---That’s OK. I can manage it by myself.
A. had been working; had had B. have been working; had
C. have been working; have D. am working; will have
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