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能否说:Hecan'tbeabletowintheraceifhedoesn'trunfastenough.是否要将can't改成won't?

题目详情
能否说:He can't be able to win the race if he doesn't run fast enough.是否要将can't改成won't?
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答案和解析
不能.这同句子:I returned back home yesterday.犯得一个错误,即意思重复.