题干
Her piano skills were so good________a ten – year – old that the judges of the contest simply couldn’t believe it.
A：for
B：a
C：to
D：about
答案(点此获取答案解析）
A
A：for
B：a
C：to
D：about
的三内角
的对边边长分别为
，若
，则
( )
，第
。
