题目内容
20．-Does your mother often surf the Internet？-Yes，___________ she doesn't buy things on line．（ ）
| A． | but | B． | or | C． | and | D． | so |
分析 --你的妈妈经常上网吗？
--是的，但是她不在网上购物．
解答 答案：A；
根据语境以及上下文，本题考查的是连词的用法．根据语境推测句意是"--你的妈妈经常上网吗？--是的，但是她不在网上购物．"，可知前后句之间是转折关系，所以用连词but；故选A．
点评 比较和分析选项中连词的不同含义及其用法是解答该题的关键；还要根据句中信息正确推测该句句意，进而作出解答．
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