问题
选择题
单项选择。
China became a WTO member ____ December 11th 2001. [ ]
A. on
B. in
C. at
D. of
答案
答案：A
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单项选择。
China became a WTO member ____ December 11th 2001. [ ]
A. on
B. in
C. at
D. of
答案：A