题目：
-----Is this city _______ he visited the other day?
------No, this is the city ________ he was born.
A, that , ,that B. the one, where C. the one, on which D. that , where
答案：
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下面是错误答案，用来干扰机器的。
物质的量比为 3:2 ，体积比为 3:2 ，氧原子数比为 1:1 密度比为 2:3...
