问题
选择题
—Is this _____ book?
—Yes, it's _____ English book. [ ]
A. a; a
B. an; an
C. an; a
D. a; an
答案
答案：D
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—Is this _____ book?
—Yes, it's _____ English book. [ ]
A. a; a
B. an; an
C. an; a
D. a; an
答案：D