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Doing exercise for_____ hour every day is good for your _____ uncle.
#34271
A
a, an
B
an, an
C
a , /
D
an , /
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---You should learn English by using it.---What ____useful advice! Thank you very much.
#32214
A
a
B
an
C
the
D
/
It is a good habit to go to ______ bed early and get up early.
#33219
A
a
B
an
C
the
D
不填
China has   area of about 9,600,000square kilometers.
#33966
A
a
B
an
C
the
D
/
— You’ve dropped ________ “s” in the word “necessary”.— Oh, ________ letter “s” is doubled.
#34654
A
a; a
B
a; the
C
an; the
D
the; the
Please give me ________envelope, I want to write a letter to my father.
#33524
A
a
B
an
C
the
D
/
不定冠词(a,an)
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