an+名词复数 an extra 2 hours

If you had an extra 2 hours a day, what would you work on?
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?“an extra + 基数词 + 名词”是常见的搭配。如:an extra ten minutes / three metres etc I ask for an extra two weeks to finish the work.? 我要求再多给两周的时间来完成工作 . (摘自:朗文当代高级英语辞典,第6版)
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