题目内容
---Could you join us this afternoon?
---Sorry, I_______. I take care of my little sister because my mother is out.
A. can’t; may B. couldn’t; have to
C. can’t; have to D. couldn’t; may
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题目内容
---Could you join us this afternoon?
---Sorry, I_______. I take care of my little sister because my mother is out.
A. can’t; may B. couldn’t; have to
C. can’t; have to D. couldn’t; may