----Can you go shopping with us this afternoon?-----Sorry,I can't.I____look after my little sister because my mother is ill.A.have to B.would C.can D.Does

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----Canyougoshoppingwithusthisafternoon?-----Sorry,Ican''t.I____lookaftermylittlesisterbecausemymothe

----Can you go shopping with us this afternoon?-----Sorry,I can't.I____look after my little sister because my mother is ill.A.have to B.would C.can D.Does
----Can you go shopping with us this afternoon?
-----Sorry,I can't.I____look after my little sister because my mother is ill.A.have to B.would C.can D.Does

----Can you go shopping with us this afternoon?-----Sorry,I can't.I____look after my little sister because my mother is ill.A.have to B.would C.can D.Does
A
抱歉,我不能去,我得照顾…… ( 客观原因)

A,必须。根据语意判断