Milk quickly turns sour () it's in a fridge.A.until B.since C.as D.unless

Milk quickly turns sour () it's in a fridge.A.until B.since C.as D.unless
Milk quickly turns sour () it's in a fridge.A.until B.since C.as D.unless

Milk quickly turns sour () it's in a fridge.A.until B.since C.as D.unless
A直到
B自从
C当---时
D除非,如果不,等于if not
根据题意知选D
句意为：牛奶如果不放在冰箱里就会很快变酸.

D

D
除非放进冰箱，不然牛奶很快会变质。表转折