问题
选择题
It's ________ unusual thing for us to find ________ UFO. [ ]
A. a; an
B. an; an
C. a; an
D. an; a
答案
答案：D
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It's ________ unusual thing for us to find ________ UFO. [ ]
A. a; an
B. an; an
C. a; an
D. an; a
答案：D