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There ’s __________“u” and __________“s” in __________  word “use”.
#33703
A
an , a, the
B
a, an ,/
C
a, a, a
D
a ,an, the
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—What’s _____most useful invention in the 20th century? —_____ computer, I think. 
#34585
A
the, A
B
a, A
C
the, The
D
/, The
He is______ outstanding boy. He studies in______ universitythat I like very much.
#33954
A
a; a
B
an; a
C
an; an
D
a; an
He made       decision to visit       Eiffel Tower the next day.
#32343
A
a; an
B
a; the
C
/; the
D
/; /
— This is _________ film I’ve told you about many times.—It’s great. I’ve never seen ________ more moving one.
#33602
A
a; a
B
the; the
C
a; the
D
the; a
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
/
不定冠词(a,an)
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