问题
选择题
This is useful book. I've read it for hour. [ ]
A. a, an
B. an, a
C. the, a
D. a, the
答案
答案：A
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This is useful book. I've read it for hour. [ ]
A. a, an
B. an, a
C. the, a
D. a, the
答案：A
