【題目】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:我的媽媽生病了,我必須在家照顧她。have to必須,不得不;must必須;has to是第三人稱單數(shù)形式;can能,會(huì)。根據(jù)句中My mother is ill.可知,這里表示客觀條件的需要,故應(yīng)用have to,選A。

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