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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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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