下面这道题该怎么选啊?
In Britain, _____ are all painted red.
A.letter boxes B.letters boxes C.letter box D.letters box下面这道题该怎么选啊?
In Britain, _____ are all painted red.
A.letter boxes B.letters boxes C.letter box D.letters box选 A letter boxes :letter 可以看成是名词作定语,修饰后面的boxes。
A