摘要:第一节:单项填空( 共15小题,每小题1分.满分15分 ) 从A.B.C.D四个选项中.选出可以填入空白处的最佳选项.21. It is waste of time for young people to devote themselves to playing computer games on the internet only for pleasure. A. /; / B. the; / C. a; a D. a; /

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