________ the problem of land erosion(侵蚀) getting more serious, the government is searching for a way to deal with it. 
#92223
A
As
B
When
C
With
D
If
推荐题目
Carl Linnaeus made great contributions to ________ plant species.
#93953
A
group
B
have grouped
C
grouping
D
been grouping
Thirty years ago William Harry was a poor boy . Now he is a respectable man . He is no longer _______.
#93764
A
that he used to be
B
what he used to be
C
the man who he used to be
D
he used to be
      good manners to say “Sorry” when you knock into someone but    no need to say it again and again .
#92894
A
There are ; there is
B
It is ; there is
C
There is ; it is
D
It is ; it is