Question

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

Answer 1

C

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。