___________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
The police set about arresting the suspect ______ they found enough evidence to prove him guilty.
#33545
A
immediate
B
as long as
C
the moment
D
as far as
_____we are closely united, we can surely overcome these difficulties.
#80342
A
As long as
B
As far as
C
If only
D
As good as
His ability has never been in doubt----the question is ___________ or not he is prepared to work hard.
#31580
A
that
B
if
C
where
D
whether
How long do you think it will be ________ the computer company puts forward a new product?
#33737
A
before
B
since
C
until
D
that