There’re more than 100 elements found in nature, are metals.
A. most of which
B. most of them
C. most of that
D. most which
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(答案→)A. most of which
B. most of them
C. most of that
D. most which
解析： 考查介词+关系词引导的定语从句。先行词为100 elements关系词which，自然界中已经发现的100种元素中大部分是金属元素。