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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:1695

I am very worried because my son ________ most of his spare time ________ playing games on the computer.

A.concentrates;on B.concentrates;in
C.focuses;to D.focuses;in
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Iamveryworriedbecausemysonmost