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
Let’s have_________ break; I want to make________ telephone call.
#34477
A
a; a
B
a; the
C
the; a
D
the; the
—What about _____ English-Chinese dictionary on the bookshelf?—In my opinion, it’s _____ useful tool book for my English learning.
#33325
A
a; an
B
an; a
C
the; a
D
the; an