【题目】He spent twenty-one hours in space.（改为否定句）
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【答案】He didn’t spend twenty-one hours in space.
【解析】
句意“他在太空中待了二十一个小时。”分析句子时态是一般过去时，句子含有实义动词，变否定句需要借助助动词didn’t，故答案为He didn’t spend twenty-one hours in space.
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