Carey didn’t go to the party last night because she ______ the baby for her sister until 9:30.

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问题 Carey didn’t go to the party last night because she ______ the baby for her sister until 9:30.

选项 A、must have looked after
B、would have to look after
C、had to look after
D、should have looked after

答案C

解析 时态用法。从上下文逻辑意义来看,C是惟一的正确答案。Carey没有参加晚会,原因是给她姐姐照看小孩子。而A和D表示对过去发生的事情根据客观情况作出主观推断:A作“准是看孩子了”讲;D作“本应该看孩子”讲,都不对。而B表示动作发生在过去的将来,也不对。所以只有C正确。
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