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What _____ useful book! And _____ book is popular with students.
#32651
A
a; a
B
an; a
C
the; the
D
a; the
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---Where may you advise me to start my business? ---In my opinion, Yichang is __________one of __________ best places for you. 
#34669
A
the, the
B
/, the
C
the, /
D
/, /
Mr. Black often goes to work by______ bus.
#32123
A
a
B
an
C
the
D
/
一What's behind          door? I can't open it.   一Let me see.Oh,there's a chair.  
#32341
A
a
B
an
C
the
D
/
— How about            talent show?   — I should say it was            great success.
#34671
A
/ ; the
B
a ; the
C
the; a
D
the; /
----______has Tom been a doctor ?       -----Since two years ago.
#32641
A
How soon
B
How much
C
How many
D
How long
不定冠词(a,an)
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