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  3. The heating system of this building is much more cost-effective than that of ...

The heating system of this building is much more cost-effective than that of ...

admin2020-12-24  52
问题 The heating system of this building is much more cost-effective than that of the previous system _______ we used last year.
选项 (A)in where                (B)where                (C)in which                (D)which
答案D
解析
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