Some of the students are nearsighted______they spend too much time watching TV or playing online games.
A．whenB．thoughC．becauseD．unless
C

試題分析：句意：一些學生近視眼，因為他們花費太多的時間在看電視和網(wǎng)絡(luò)游戲上。A當連接時間狀語從句B雖然，轉(zhuǎn)折連詞，D如果不，條件狀語從句。故選C，因為，連接原因狀語從句。
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