题目内容
19．-Unfortunately，I won't have time to visit the World Expo 2010 _____ I'm in Shanghai．-What a great pity!（ ）
| A． | until | B． | since | C． | while | D． | unless |
分析 ---不幸的是，当我在上海的时候，我没有时间去参观2010世博会．
---很遗憾啊！
解答 案：C．根据选项until直到…，since自从…，while当…时，尽管，然而（前后对比），unless除非…，再结合句意，当我在上海的时候，我没有时间去参观2010世博会，可知此处缺少了一个引导时间状语从句的连接词，故C正确．
点评 本题考查时间状语从句的连接词，在充分分析句型再结合语义的基础上便能选出正确答案，同时要注意其他选项的意思，
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