Bill was doing a lot of physical exercise to build up his.A. abilityB. forceC. strengthD.

问题补充：

Bill was doing a lot of physical exercise to build up his.

A. ability

B. force

C. strength

D. mind

答案：

A. ability

B. force

(答案→)C. strength

D. mind

解析：build up one’s strength使自己强壮。

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