In ____ accident _____ knowledge of first aid can make _____ real difference.
#7974
A
an; a; a
B
the; a; the
C
an; the; 不填
D
a; a; 不填
The singer and________dancer is said to perform in our school on________May Day.
#7980
A
the; 不填 
B
a;不填
C
不填; the
D
不填; 不填
不定冠词
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