——Now lots of teenagers spend a lot of time playing computer games.
——Yes. Teachers and their parents should prevent them ______________ too much.
A．to playB．playC．playsD．playing
D

試題分析：prevent sb. (from )doing sth.表示“阻止某人做某事”，這是一個固定用法。本句的意思是“老師和家長應(yīng)該阻止他們玩的太多�！彼员绢}選D。
點評：對于prevent的用法，應(yīng)該熟練掌握，其用法與stop和keep的用法一樣，都表示“阻止某人做某事”。
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