December 11,2001, China formally became the 143rd member of the WTOA. inB. OnC. AtD. Until

发布时间：2020-08-20 20:29:54

    December 11,2001, China formally became the 143rd member of the WTO
A. in
B. On
C. At
D. Until

网友回答

A. in
(答案→)B. On
C. At
D. Until
解析：在具体的某一天介词用On，所以选B.
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