_______ 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
A man cannot smile like a child，________ a child smiles with his eyes，while a man smiles with his lips alone.
#30688
A
so
B
but
C
and
D
for
Feathers fall to the ground slowly,________ stones fall much faster.
#80177
A
but
B
however
C
while
D
yet
Many experts hold the view teacher development is the key to better education lies.
#33350
A
which; where
B
which; in which
C
that;where
D
that;in which
—May I go outside and play for a while, Dad?—No, you can’t ____ your homework is being done.
#34531
A
until
B
as
C
before
D
the moment
—I’d like to invite you to my new house next weekend.—Thank you, but ____ I’ll have time I’m not sure at the moment.
#34533
A
when
B
as
C
in case
D
unless