What's a letter box?It's a box with a hole through which the postman puts the letters.

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• 例句：S1:what's a letter box?S2:It's a box with a hole through which the postman puts the letter
• What's a letter box?It's a box with a hole through which the postman puts the letters.
• 例句：S1:what's a letter box?S2:It's a box with a hole through which the postman puts the letter根据上面的形式改写下面句子 1.what's a gym?(in which) 2.what's a vacation?(during which) 3.what's a library?(from which) 4.what's a university?(at which) 5.what's a doctor?(to whom) 6.what's a studio?(at which) 7.who's Father Christmas?(from whom) 8.what's a good friend?(with whom)急用！
• What's a letter box?It's a box with a hole through which the postman puts the letters.我大概知道这题是要做什么 可是为什么是这样做呢?
• 英语翻译Do not judge others,because you have not experienced in his life.
• ∫ (6xy^2-y^3)dx+(6x^y-3xy^2)dy