He invited all of his ______ to join his wedding party为什么选c

问题描述:

He invited all of his ______ to join his wedding party为什么选c
He invited all of his ______ to join his wedding party
A.comrade-in-arms
B.comrades-in-arms
C.comrades-in-arm
D.comrade-in-arm
以可数名词加介词短语构成复合词变复数时不是要把前面的名词变复数

答案是B.
一个战友:comrade-in-arms; 所有战友;comrades-in-arms
类似的还有一个单词:passer-by 路人;passers-by