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【题目】—Let’s go fishing, Scott.

—Sorry, I can’t. I help mom look after my baby sister at home.

A.have toB.used toC.couldD.can

【答案】A

【解析】

句意:——斯科特,我们一起去钓鱼吧。——对不起,我不能。我不得不在家帮我妈妈照顾我的妹妹。

考查情态动词。have to不得不;used to过去常常;could能够;can能。 根据Sorry, I can’t.可知我不能去,下一句叙述理由。have to强调客观上的必要性,意为不得不。故选A

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