The operation could prolong his life by two or three years.A:broaden B:worsen

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问题 The operation could prolong his life by two or three years.

选项 A:broaden
B:worsen
C:extend
D:accelerate

答案C

解析本句意思：这次手术可使他多活两三年。prolong意为“延长”，与extend (延伸，延续）意思相近。broaden扩大；worsen恶化；accelerate加速。

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