摘要： This is useful book. A. a B. an C. the D. /

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I think this is ______ useful book.

A. a B. an C. the D. /

 

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This is             useful book,              book is my brother's.

A．a; the B．an; the 
C．a; an D．an; a 

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This is _____ useful book. _____ book is written by Bill Gates.
[     ]

A. the; The
B. a; A
C. a; The
D. an; The

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This is _____ useful book. I read _____ book every day.
[     ]
A. an, /
B. an, the
C. a, the
D. a, 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
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