考博考试

【单选题】 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.
A．imbibeing
B．modifying
C．increasing
D．upgrading

网考网参考答案：D
网考网解析：
upgrade升级，提升；imbibe吸收；modify如更改，修改。 查看试题解析出处>>