【題目】 He _________________ stay at home and look after his mother yesterday.

A. needed to B. must C. have to D. has to

【答案】A

【解析】句意：他昨天需要待在家照顧他的媽媽。needed to 需要去做某事，因為yesterday所以本句話的時態(tài)用過去時，need to do中的need是實義動詞；must 必須，一定，表示必須，指的是一種責任和義務(wù)，不用于表示發(fā)生了的事情；表示一定，是一種推測，過去時用must have done來表示；have to 不得不；has to是have to的第三人稱單數(shù)形式，二者都是現(xiàn)在的形式，故不對。故選A。

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