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问题: I need your help

I can't live___ sports
A.by
B.on
原因详细

解答:

live on 和live by 都有“靠---生活”的意思。但有区别:前者后面常跟sb;后者后面常跟sth,即靠某种职业。
如:
The old man lived by begging.
他靠乞讨为生。She lives by the pen.
她靠写作谋生。
He still lived on his parents after graduation.
毕业之后他仍然靠父母生活。
句意为不能靠体育这种职业为生,故选A.