单项选择题

According to the rules of the factory, you mustn't ask for leave ______ you have a doctor's note.

A．unless
B．on condition
C．though
D．until
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______ good use you've made of your time to study, there's still room for improvement.
A．Whatever
B．However
C．Though
D．That
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If you lose one hour in the morning, ______ you will be looking for it the rest of the day.
A．/
B．and
C．or
D．so
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