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最佳答案：It's a good idea.
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最佳答案：Who can think of this good idea?/ Who can come up with this good idea?
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最佳答案：a good idea
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最佳答案：It's a good idea to go traveling during you holiday.
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最佳答案：It seems a good idea.
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最佳答案：I got an idea.
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最佳答案：81 of them
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最佳答案：I come up with a good idea.
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最佳答案：It's a good idea to take a walk/go for a walk/walk along/go walking
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最佳答案：It's a good idea to go for a walk when you feel nervous