tablet computers like Apple’s iPad just before bed, a research says recently, can lead to poor night’s sleep.
| A．Using |
| B．Used |
| C．To use |
| D．Use |
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tablet computers like Apple’s iPad just before bed, a research says recently, can lead to poor night’s sleep.
| A．Using |
| B．Used |
| C．To use |
| D．Use |
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