单项选择题

Dr. Caron told me to take the medicine ______ a day.

A．two
B．two times
C．twice
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单项选择题
______ the long walk the old man seemed rather tired.
A．Before
B．After
C．Since
单项选择题
The doctor told me to drink ______ water and have a good rest.
A．plenty of
B．much of
C．a lots of
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