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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