During the period 1490—1979 the main progress mentioned in this passage was______. The German, Augustus Siebe, invented the "ha

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问题 During the period 1490—1979 the main progress mentioned in this passage was______.
The German, Augustus 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 or so.

答案A

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