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Our class discussed the question of __________it is necessary for us students to use mobile phones on campus.
A.ifB.whereC.whether D.that
 C
本题考查宾语从句。句意:我们班上讨论了我们的学生在校园是否有必要使用手机的问题。
结合句意可知of后接宾语从句,有“是否”的含义,故用whether。介词后的从句不用if引导。
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