问题

Milk will turn sour soon on hot days ______ it is stored in the refrigerator
A:since
B:until
C:because
D:unless
B:until
C:because
D:unless
正确答案是:
同类题型
The meat smells _________. You’d better throw it away.
It is the ability to do the job___matters not where you come from or what you are.
What color are the cats—I think white and black.
_____ mobile phone is very convenient, school children are not allowed to own one.
Here are the first three books of his poem works, with the fourth one to _____ next month.