2004-05-39 help help!!

v22

39.Jetties, piers designed to aid in marine navigation, are constructed primary of wood, stone, concrete, or combinations of these materials

primary 改成什么？

shinedie

of 前应为名词和形容词最高级.知道错就行了.primary 在此作形容词,而primary 的名词的意思是初级飞羽或初选的意思,不符.

dpatton

would it be possible changing "primary" to "primarily", not sure