填空题 Tom spent two hours doing his homework. It ______ Tom two hours ______ his homework.
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【正确答案】 1、took，to do。    
【答案解析】[精解] 本题是考查it作为形式主语的情况，It takes sb．…to do sth．．与 cost，spend之间的相互转换是常考的知识点，希望考生注意掌握。