2. 外语
  3. This ______ (discover) of diamond came at time when there was a big demand.

This ______ (discover) of diamond came at time when there was a big demand.

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问题 This ______ (discover) of diamond came at time when there was a big demand.
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答案discovery
解析 词性转换。此处需要discover的名词形式：discovery。[例句] For fear of discovery he changed his lodgings every night。为了怕被人发现，他每夜换一个住宿的地方。
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