问题补充：
. Intelligence is to some extent one is born with
A. that
B. of which
C. something
D. which
答案：
A. that
B. of which
(答案→)C. something
D. which
解析：to some extent 是插入语，可忽略。则该句是Intelligence isone is born with. One后面缺少先行词，故用代词something作先行词，省略关系代词that。选C。
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