He is doing his homework为什么该句中的doing用原形

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• He spent two hours ()(do)his homework.答案是doing. 而我写了did.为什么不是did呢?不是已经做了作业再说的吗,那就用过去式啊.我想不通诶,Help me!
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• He is doing his homework为什么该句中的doing用原形
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