题目内容
4．Anna had a fever yesterday，so she wasunable （able） to go to school．分析 安娜昨天发烧了，所以她不能去上学了．
解答 答案：unable；根据句中信息Anna had a fever yesterday，推测"她不能去上学"；unable，不能的，不会的； 无能力的；故填unable．
点评 根据句意判断出给出单词在句子中充当的成分，运用其适当形式作答．
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