There are a lot of computers in the lab,and they need professional to make sure
题型：不详难度：来源：
There are a lot of computers in the lab,and they need professional to make sure they can be in a good state.| A．operation | B．maintenance | | C．service | D．advice |
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答案
| B |
解析
| maintenance保养；operation操作；service服务；advice建议。 |
举一反三
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