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— 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
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________ Greens are on _________  visit to the Great Wall. 
#32190
A
/; a
B
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C
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It’s       time for us as parents to teach our children       right way to dress.
#33920
A
a; the
B
the; a
C
the; /
D
/; the
不定冠词(a,an)
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