公共英语一级
单选题—Can you go shopping with us this afternoon?
— Sorry,I can't. I __________ take care of my little sister because she is ill.
— Sorry,I can't. I __________ take care of my little sister because she is ill.
A．have to
B．may
C．would
参考答案：A进入在线模考
[A]。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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