问题
选择题
| There are three libraries in our school, ______ were built five years ago. |
A. all of them B. either of them C. all of which D. both of that |
答案
答案：C
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| There are three libraries in our school, ______ were built five years ago. |
A. all of them B. either of them C. all of which D. both of that |
答案：C