填空题 They realized Hainan was a beautiful place after they reached there. They ______ realize Hainan was a beautiful place ______ they reached there.
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【正确答案】 1、{{U}}didn't, until{{/U}}    
【答案解析】[解析] 分析结构：原句中句子使用宾语从句，改写的句子中使用了not... until从句，考点为从句的改写。对比填空：句子中缺少表示“直到……才”意思的结构，即not... until。原句时态为过去时，所以正确答案为didn't, until。