问题
选择题
All of __ sudden , I saw __ UFO with _____ alien in it flying in front of my house.
A. the ; the ; a B a ; the ; a C. a ; an ; an D. a ; a ; an
答案
答案：D
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All of __ sudden , I saw __ UFO with _____ alien in it flying in front of my house.
A. the ; the ; a B a ; the ; a C. a ; an ; an D. a ; a ; an
答案：D