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His bike is broken.He is busy m--- it.

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His bike is broken.He is busy m--- it.
His bike is broken.He is busy m--- it.
意思:他的自行车坏了,他正忙着……它.
显然,应该是正在忙于“修理(自行车)”,以字母"m"开头,意思为“修理”单词为mend
但是,be busy doing sth为.固定搭配;
故此处应填:mending