After the operation, Bill has been doing a lot of physical exercise to build up his .A. ab

发布时间：2020-08-16 18:57:03

After the operation, Bill has been doing a lot of physical exercise to build up his     .
A. ability
B. strength
C. energy
D. mind

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A. ability
(答案→)B. strength
C. energy
D. mind
解析：考查名词。build up one’s strength增强体质，固定搭配，故选B。
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