His little brother spent half an hour c____ the mistakes in his homework last night.

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His little brother spent half an hour c____ the mistakes in his homework last night.
His little brother spent half an hour c____ the mistakes in his homework last night.

His little brother spent half an hour c____ the mistakes in his homework last night.
His little brother spent half an hour c(orrecting )the mistakes in his homework last night.
注:correct 改正
SPEND +时间/金钱+ DOING STH 固定用法
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His little brother spent half an hour correcting the mistakes in his homework last night.
correct,订正。

correcting,spend time/money (in)doing sth 花费时间或金钱做某事,in可以省略
昨晚他的弟弟花了半个小时改正家庭作业里的错误