His father is engineer. He designed such useful machine
#33029
A
a an
B
an a
C
an an
D
a a
推荐题目
Her daughter began to play _____piano when she was five. Now she's very good at it.
#34521
A
an
B
a
C
the
D
/
What _______honest boy! And he is ______ best student of all.
#34421
A
a; a
B
an; the
C
a; the
D
the; the