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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
本題考查賓語從句。句意：我們班上討論了我們的學生在校園是否有必要使用手機的問題。
結合句意可知of后接賓語從句，有“是否”的含義，故用whether。介詞后的從句不用if引導。
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