At that time his family Waas very poor，so he couldn't go to school．Which of the following is the closest in meaning to the underlined part？A.didn't have toB.shouldn'tC.was not able toD.might not
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C解析分析：肯定句的was(were)able to do和could表示“能力”时有区别，但否定结构时，没有区别。didn't have to(不必要)，shouldn't(不应该)，might not(可能不)