earth是不可数名词,但是stone却是可数名词,为什么stone不加s呢
15.TheGreatWallwasmadenotonlyby_______,butalsothefleshandbloodof________men.
A.earthandstone,millionsofB.earthsandstones,millions
C.theearthandstone,millionofD.theearthsandstones,millions
解析:earth是不可数名词,因此删除BD,数以百万的应为millionsof.