问题
选择题
There is _____ "s" and _____ "u" in the word "useful". [ ]
A. a; an
B. an; a
C an; an
D. a; a
答案
答案：B
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There is _____ "s" and _____ "u" in the word "useful". [ ]
A. a; an
B. an; a
C an; an
D. a; a
答案：B