问题
选择题
Mr. Black decided to give up his farm and devoted all his time to _____ those children living on the street.
[ ]
A. help
B. being helped
C. be helping
D. helping
答案
答案：D
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Mr. Black decided to give up his farm and devoted all his time to _____ those children living on the street.
[ ]
A. help
B. being helped
C. be helping
D. helping
答案：D