问题
选择题
I've earned my own living since I was seven, ______ all kinds of jobs.[ ]
A. doing
B. having done
C. to do
D. to have done
答案
答案：B
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I've earned my own living since I was seven, ______ all kinds of jobs.[ ]
A. doing
B. having done
C. to do
D. to have done
答案：B