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—Could you join us this afternoon? —Sorr...

—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

 

C 【解析】 句意:——今天下午你能加入我们吗?——对不起,我不能。我不得不照顾我的小妹妹,因为我母亲外出了。 根据Could you join us this afternoon?是询问是否能做某事,表示征询意见,如果允许,用can,不允许用can’t。may可以; have to不得不;根据sorry表示不允许,故用can’t。根据because my mother is out.可知母亲外出,他不得不照顾他的妹妹,故用have to。故选C。  
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