问题
选择题
_____ to paint the house, John found it embarrassed to have to stop half way. [ ]
A. Volunteering
B. Having volunteered
C. To volunteer
D. Volunteered
答案
答案：B
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_____ to paint the house, John found it embarrassed to have to stop half way. [ ]
A. Volunteering
B. Having volunteered
C. To volunteer
D. Volunteered
答案：B