Fighting an artificial greenhouse effect seems to be the greatest of environmental challenges, ________？
#64479
A
isn't it
B
does it
C
doesn't it
D
is it
推荐题目
..Is Tina as tall as you?... She is shorter than me
#59824
A
Yes, she is
B
No, she isn't
C
Yes, she does
D
No, she doesn't
— _______ _______do you go to the library?—Twice a week.
#59952
A
How much
B
How many
C
How old
D
How often
The young man who we talked a lot about yesterday is unfit for the work, _____?
#65206
A
didn’t we
B
did we
C
is he
D
isn’t he
I told you that you shouldn't waste your time playing the computer games,_____________?
#65482
A
didn't I
B
did I
C
should you
D
shouldn't you