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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
C
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科目：高中英語 來源：專項題 題型：單選題

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

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