2. 外语
  3. John used to be such a computer buff that he spent a large part of his income ______ his computer whenever a new CPU was introdu

John used to be such a computer buff that he spent a large part of his income ______ his computer whenever a new CPU was introdu

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问题 John used to be such a computer buff that he spent a large part of his income ______ his computer whenever a new CPU was introduced.
选项 A、imbibeing
B、modifying
C、increasing
D、upgrading
答案D
解析 upgrade升级，提升；imbibe吸收；modify如更改，修改。
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