问题
选择题
_______December 11,2001, China formally became the 143rd member of the WTO
A．in
B．On
C．At
D．Until
答案
答案：B
在具体的某一天介词用On，所以选B.
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_______December 11,2001, China formally became the 143rd member of the WTO
A．in
B．On
C．At
D．Until
答案：B
在具体的某一天介词用On，所以选B.