单项选择题

Flexible working hours were firstly used by the ______.

A．British
B．Americans
C．Germans
D．Japanese
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单项选择题
In order to stay healthy, it is a good idea ______ your doctor at least once a year.
A．visits
B．to visit
C．that visits
D．visited
单项选择题
______ to help was a great encouragement to us.
A．Their coming
B．Their came
C．They coming
D．They come
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