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Don't make____________same mistake for the second time in____________day.
#33074
A
the; a
B
a; a
C
the; the
D
a; the
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— Have you seen _____ empty box?— Do you mean _____ box you showed to me yesterday? I put it in your schoolbag.
#34175
A
a, the
B
an, a
C
an, the
D
the, a
________ Dongtai you see today is _______ different city from what it used to be. 
#33310
A
The, a
B
/, a
C
A, the
D
The , /
China has _____ area of about 9,600,000 square kilometers, including Diaoyu Island(钓鱼岛) .
#33537
A
a
B
an
C
the
D
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This is         3-D printer. And this is an artificial (人工的) ear. Can you believe that scientists printed this artificial ear by this 3-D printer?
#33175
A
a
B
an
C
the
D
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 —Class is over.—Look, _________ number of students are playing football there. Let’s go and join them.
#32746
A
/
B
a
C
an
D
the
不定冠词(a,an)
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