想请教各位先进, 以下是我看到的一些关系副词的用法, 不知以下我的判断是否正确? (第一题都是原来的写法, 正确无误. 二, 三题是我自己改写和判断的) 1. This is exactly the reason why millet is widely grown as the main crop in certain region of Asia, such as India, where the average temperature tends to be high. 2. This is exactly the reason why millet is widely grown as the main crop in certain region of Asia, such as India in which the average temperature tends to be high. (正确) 3. This is exactly the reason why millet is widely grown as the main crop in certain region of Asia, such as India which the average temperature tends to be high in there. (正确) 1. This is the university where my father used to attend. 2. This is the university at which my father used to attend. (错误) 3. This is the universtiy which my father used to attend at. (错误) 不知道这两组的第二和第三句, 我的判断是否正确? 谢谢各位! --

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