4there are seven days in a week 对seven days提问5there are some trees in front of the school 改为否定句
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时间：2024-08-17 10:49:19
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4there are seven days in a week 对seven days提问5there are some trees in front of the school
【专家解说】：4. How many days are there in a week ? 5. There aren't any trees in front of the school .
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