填空题 1 (一看到) the old friend that she had not seen for years, she burst into tears.

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【正确答案】 1、At the sight of/On seeing the old friend that she had not seen for years, she burst into tears.    
【答案解析】本题测试词组用法。“一看到……”可用直接具有这种意思的词组at the sight of表达，也可用语法结构“on+doing”，介词on在此结构中即有“一……”的意思。