Modern medical advances ______ the average life expectancy by several years.

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问题 Modern medical advances ______ the average life expectancy by several years.

选项 A、expanded
B、spread
C、extended
D、enlarged

答案C

解析 extend“延伸，延续”；expand“扩大，膨胀”；enlarge“扩大，扩展”。

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大学英语四级

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