(C)38.A Friend of ______ says he prefers the version of ..

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them是they的受格
主詞+動詞+受詞
前面沒有主詞和動詞所以不能用them

這幾天在看英文文法，對這題也不太懂
不曉得是否能作如此解釋:所有代名詞
A Friend of ______ says he prefers the version of the Christmas story written by Henry.
A Friend of their friends says he prefers the version of the Christmas story written by Henry.
A Friend of theirs says he prefers the version of the Christmas story written by Henry.