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