(For) the purposes of the fine and decorative arts, (metals have) been (used) either in their simple state (and) in uncomplicate

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问题 (For) the purposes of the fine and decorative arts, (metals have) been (used) either in their simple state (and) in uncomplicated alloys.

选项 A、For
B、metals have
C、used
D、and

答案D

解析
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