Flexible working hours were firstly used by the . Key time is a period when .

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问题 Flexible working hours were firstly used by the ______.
Key time is a period when ______.

选项 A、visitors come to the plants
B、all workers must be at work
C、employers go round in the workshops
D、rush hours are over

答案B

解析从文章第二段第三句"These are，firstly，that all workers must be present for certain"key"times in day"，我们可以猜出，"key"time应该表示工人们每天必须在厂内工作的一段固定时间。

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大学英语三级B级

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