问题描述：
速求 帮下忙做一道英语题 解释下为什么要选这个
Tina,would you like to go to my party on Sunday?
I‘m sorry,--------I have to look after my sick mother in the hospital.
A.but B.and C.so D.or
Tina,would you like to go to my party on Sunday?
I‘m sorry,--------I have to look after my sick mother in the hospital.
A.but B.and C.so D.or
问题解答：
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