What _____ useful book! And _____ book is popular with students.
#32651
A
a; a
B
an; a
C
the; the
D
a; the
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---This is useful machine which was made in ________thirteenth century
#32923
A
a, the
B
an , the
C
/, the
D
the , /
As we know, England is European country and Singapore is Asian country.
#33638
A
an； an
B
an； a
C
a； A
D
a； an