题文
Don’t turn off the computer before closing all programs，________ you could have problems. (2013·北京，22)
| A．or | B．and |
| C．but | D．so |
推荐试卷
Don’t turn off the computer before closing all programs，________ you could have problems. (2013·北京，22)
| A．or | B．and |
| C．but | D．so |
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