In 1490 or so, the main progress mentioned in this passage was ______. The German, Augusts Siebe, invented the "hard-hat suit"

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问题 In 1490 or so, the main progress mentioned in this passage was ______.
The German, Augusts Siebe, invented the "hard-hat suit" which was used

选项 A、for nearly a hundred years
B、for almost a thousand years
C、for over a century
D、for a century

答案A

解析
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