问题描述：
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?
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?
问题解答：
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