had to look , must look , should have looked , after, on, at Carey didn’t go to the party last night because she______ ______the

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问题 had to look , must look , should have looked , after, on, at
Carey didn’t go to the party last night because she______ ______the baby for her sister until 9:30.

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答案had to look,after

解析 译文:凯利昨晚没参加聚会因为她不得不照顾她姐姐的孩子直到9点半。have to和must都指必须,但have to指的是客观上的不得不;must指主观上的必须;另外,主句用的时态为过去时,因此,从属分句也相应地用过去式had to。look after意为“照顾,照看”,是固定用法。答案为had to look,after。
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