问题描述：
Such（）fine weather is（）unusual chance for us to
go swimming.
a.a,an
b./,an
c./,a
d./,the
麻烦解释一下,谢谢
go swimming.
a.a,an
b./,an
c./,a
d./,the
麻烦解释一下,谢谢
问题解答：
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