________ is known to all is that effective measures should be taken to deal with the problem of the overexploitation of our resources.
#67275
A
What
B
It
C
As
D
Which
推荐题目
_________ your composition carefully, some spelling mistakes can be avoided.
#68935
A
Having checked
B
Check
C
If you check
D
To check
--Are you sure ____ you have seen this man?---Yes, I’m quite sure ___that.
#71728
A
that, about
B
/, to
C
of, about
D
about. of
While Helen __________ the guitar, her mother came in.
#41299
A
was playing
B
is playing
C
played
D
plays
I have bought 2 ballpens, _______ writes well.
#70187
A
both of which
B
none of which
C
neither of which
D
neither of them
It is generally believed that teaching is _____ it is a science.
#74559
A
an art much as
B
much an art as
C
as an art much as
D
as much an art as