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【题目】My mother is ill.I ________ look after her at home.

A. have toB. must

C. has toD. can

【答案】A

【解析】

句意:我的妈妈生病了,我必须在家照顾她。have to必须,不得不;must必须;has to是第三人称单数形式;can能,会。根据句中My mother is ill.可知,这里表示客观条件的需要,故应用have to,选A

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