摘要：This is useful book.It’s unusual book. A.an;a B.a;a C.an;a D.a;an
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— This is _____ useful book. I think.
— So it is, and it's _____ unusual one.
— So it is, and it's _____ unusual one.
[ ]
A. an, 不填
B. an, an
C. a, an
D. a, a
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B. an, an
C. a, an
D. a, a
--This is _______ useful book, I think.
--So it is, and it's ________ unusual one.
[
]|
A ．an; / |
B ．an; an |
C ．a; an |
D ．a; a |