Flexible working hours were firstly used by the ______. [br] "Key" time is a per

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问题 Flexible working hours were firstly used by the ______. [br] "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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