问题标题：
Ispenthalfanhour___myhomework.AfinishdoingBtofinishdoingCfinishingtodoDfinishingdoing
问题描述：
Ispenthalfanhour___myhomework.AfinishdoingBtofinishdoingCfinishingtodoDfinishingdoing
金通洸回答：
spendsometimedoingsth.花时间做某事.
finishdoingsth.完成了某事.
选Dfinishingdoing
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