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
—English has a large vocabulary, _______?—Yes. Know more words and expressions and you will find _______ easier to read and communicate.
#65426
A
hasn't it; it
B
doesn't it; that
C
has it; what
D
does; one
— I wonder _____ you’ll water this kind of flower. — Every other day.
#64715
A
how much
B
how long
C
how soon
D
how often
---Is that your friend?--- ______________.
#60064
A
Yes, it’s
B
Yes, it isn’t
C
Yes, it is
D
Yes, he is