Question

Who helped Tom finish doing his work --- Jim a friend of ___.

Who helped Tom finish doing his work
--- Jim a friend of ___.
A. Tom's father B. Tom's father's C. Tom father's D. Tom father
我知道这道题选B,为什么选B啊？

Answer 1

Jim a friend of _ Tom's father's__.
这是因为在“ Tom's father's” 后边省略了一个“friend（s）”
意为他爸爸的朋友中的一个（朋友）。
虽然有点拗口，但逻辑上就是这样。