代词指代是否真有优先级？

teddyabc

以前论坛里面有前辈讨论过的这道题：
106.    In large doses, analgesics that work in the brain as antagonists to certain chemicals have caused psychological disturbances in patients, which may limit their potential to relieve severe pain.
(A) which may limit their potential to relieve
(B) which may limit their potential for relieving
(C) which may limit such analgesics’ potential to relieve
(D) an effect that may limit their potential to relieve
(E) an effect that may limit the potential of such analgesics for relieving

答案 D，其中their potential中their指代比较困惑。

- 誓不低头的重生 2006-10-06 23:25:00

关于their指代不清的问题：

指代的优先级：主句主语>主句宾语>从句主语>从句宾语

their在这里指代 analgesics不会引起汉语意思上的歧义啊 ？

也符合指代优先级啊


“指代的优先级：主句主语>主句宾语>从句主语>从句宾语”
真的存在这种优先级吗？

victoria820

你仔细看PREP的话会发现很多正确选项都没有完全避免代词指代上的模糊。
像这种没有绝对错误（单复数、代词指代整个句子、it指代了名词及其修饰成分）的代词指代一般放在最后去考虑。我们选的一定是5个选项中相对正确的一个。

teddyabc

谢谢指点。