單項選擇。
China became a WTO member ____ December 11th 2001.

A. on
B. in
C. at
D. of
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科目：初中英語 來源：專項題 題型：單選題

單項選擇。
China became a WTO member ____ December 11th 2001.
[     ]
A. on
B. in
C. at
D. of

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