___________there are many different types of food, some animals spend their lives eating only one type.
#31689
A
Since
B
Unless
C
Once
D
While
推荐题目
Schools in the east tend to be better equipped, ____ those in the west are relatively poor.
#32277
A
As
B
While
C
When
D
But
After studying mass of data，they drew a conclusion________China is still a developing country.
#30622
A
that
B
which
C
／
D
where
______ we have enough evidence (证据), we can't win the case.
#30742
A
Once
B
As long as
C
Unless
D
Since