2. 外语
  3. Ores which (are occurred) naturally (as) elements, such as gold (are of) extreme rarity and (are occasionally) of high value.

Ores which (are occurred) naturally (as) elements, such as gold (are of) extreme rarity and (are occasionally) of high value.

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问题 Ores which (are occurred) naturally (as) elements, such as gold (are of) extreme rarity and (are occasionally) of high value.
选项 A、are occurred
B、as
C、are of
D、are occasionally
答案A
解析
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