问题
选择题
It's ______ excellent chance to know about the world to visit the 2012 London Olympic Games. [ ]
A. a
B. an
C. /
D. the
答案
答案：B
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It's ______ excellent chance to know about the world to visit the 2012 London Olympic Games. [ ]
A. a
B. an
C. /
D. the
答案：B