问题
选择题
| —Can you join us this afternoon? —Sorry, I can't. I take care of my little sister because my mother is out. |
A. can B. may C. would D. have to |
答案
答案：D
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| —Can you join us this afternoon? —Sorry, I can't. I take care of my little sister because my mother is out. |
A. can B. may C. would D. have to |
答案：D