-- Can you go shopping with us this afternoon?-- Sorry, I can’t. I ______ take care of my little sister because she is ill.

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问题 -- Can you go shopping with us this afternoon?-- Sorry, I can’t. I ______ take care of my little sister because she is ill.

选项 A、have to
B、may
C、would

答案A

解析考查情态动词。have to指“必须”，may表示“可以，可能”，would表示意愿和(过去)将来、或者表示委婉语气。由空格前的can’t可知应选[A]。

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