中文谷---Couldyoujoinusthisafternoon? ---Sorry,I
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问题详情：
---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
【回答】
C
知识点：情态动词
题型：选择题
标签：
SorryI
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