题目内容
10．Some of the students are nearsighted ____ they spend too much time watching TV or playing online games．（ ）| A． | when | B． | though | C． | because | D． | unless |
分析 一些学生近视眼，因为他们花费太多的时间在看电视和玩网络游戏上．
解答 答案：C A当…的时候，连接时间状语从句；B虽然，转折连词，连接让步状语从句；C，因为，连接原因状语从句；D如果不，除非，连接条件状语从句．根据前后句的语境可知，学生花大量的时间在看电视和玩电脑游戏上是他们中一些人近视的原因，所以这里应该用连词because引导一个原因状语从句．故选C，
点评 此题考查连词的辨析．做题时一定要结合前后的语境判断出主句和从句之间的关系，再结合选项选出符合句意的连词．
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