问题补充：
It is believed that intelligence is to extent we are born with.
A. some, anything
B. any, something
C. any, nothing
D. some, something
答案：
A. some, anything
B. any, something
C. any, nothing
(答案→)D. some, something
解析：本题考查代词。to some extent是固定短语“在某种程度上”。something是与is构成“系表结构”，主语是intelligence。we are born with是定语从句，修饰something。另，something后面省略了引导词that。
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