题目内容
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 |
C
解析试题分析：句意：一些学生近视眼，因为他们花费太多的时间在看电视和网络游戏上。A当连接时间状语从句B虽然，转折连词，D如果不，条件状语从句。故选C，因为，连接原因状语从句。
考点：考查连词
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