_______ there are many different types of food, some animals spend their lives eating only one type.
#30197
A
Since
B
Unless
C
Once
D
While
推荐题目
Don’t start reading a book ________ you find that it’s one you can read with ease and understanding.
#32363
A
when
B
if
C
unless
D
though
________ everyone else wouldn’t go to the mountain area, he went without a second thought.
#80487
A
As long as
B
While
C
Where
D
In spite of
----Have you got the result? ----No, It will be some time ________we know the result.
#34360
A
when
B
since
C
if
D
before
At school，some students are active ________ some are shy，yet they can be good friends with one another.
#30233
A
while
B
although
C
so
D
as