In America, if ________ friend has invited you to drop by anytime, it is ________ best to call before visiting to make sure it is convenient for him.
#9782
A
a; a
B
the; a
C
a; 不填
D
the; 不填
推荐题目
In 1948, three American scientists invented ____ transistor, which is ____ small electronic device to control an electric current.
#8790
A
the; a
B
a; a
C
the; the
D
a; the
____ friend of my grandfather’s will come tomorrow. I’m wondering how old ____ man he might be.
#10052
A
The; a
B
The; the
C
A; a
D
A; the
Although their new factory building is still under construction, we have already placed order for 200 pairs of shoes.
#9109
A
the; an
B
a; an
C
/; an
D
/; /
Historically, _____ main material for making tables has been wood, but _____ metal and stone have also been used.
#10310
A
the; the
B
the; /
C
/; the
D
/; /