The appearance of the book has marked a new ______ in the history of the question.

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问题 The appearance of the book has marked a new ______ in the history of the question.

选项 A、beginning
B、discovery
C、area
D、era

答案D

解析 era n.时代,纪元。beginning n.开始,开端。discovery n.发现。area n.面积:地区;领域。
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