It took him half an hour to do his homework.=＿＿＿＿＿＿＿＿＿＿＿.

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It took him half an hour to do his homework.=＿＿＿＿＿＿＿＿＿＿＿.

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It took him half an hour to do his homework.=＿＿＿＿＿＿＿＿＿＿＿.
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举一反三
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