单项选择题

According to "Flextime" system workers need not ______.

A．work by the same timetable
B．work all the weekdays
C．go to work at weekends
D．go to work in the early morning
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Scarely had I reached there ______ it began to rain.
A．than
B．that
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If you had ______ the doctor's advice, you would have recovered already.
A．followed
B．listened
C．heard
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