In hot summer, milk quickly turns sour it is refrigerated.
#31564
A
while
B
if
C
until
D
unless
推荐题目
All the photographs in this book，________ stated otherwise，date from the 1950s.(2012·陕西，25)
#30219
A
unless
B
until
C
once
D
if
Convenient ___private cars are for us, they may also cause traffic accidents and pollution.
#33185
A
while
B
as
C
if
D
since
—Are you ready for Spain?—Yes.I want the girls to experience that________ they are young.
#30059
A
while
B
until
C
if
D
before
Don’t you know that Australia was, as a matter of fact, _________ used to be a nation of prisoners!
#31157
A
where
B
what
C
which
D
that