题干
It's ______ unusual thing for _____ eight-year-old girl to find _____ UFO.
A：a, a, a
B：an, a, an
C：a, an, an
D：an, an, a
答案(点此获取答案解析）
D
It's ______ unusual thing for _____ eight-year-old girl to find _____ UFO.
A：a, a, a
B：an, a, an
C：a, an, an
D：an, an, a
