Milk quickly goes bad in summer       it is in a fridge (冰箱). 
#55517
A
if
B
because
C
unless
D
When
推荐题目
.—_____?     —I usually play tennis.
#56077
A
Why do you play tennis
B
What do you usually do on weekends
C
When do you play tennis
D
Where do you play tennis
—   do you have an Art Festival in your school? —Once a year.
#56324
A
How long
B
How often 
C
How far
D
How soon