单项选择题

The medicine is one sale everywhere. You can get it at ______ chemist' s,

A．each
B．some
C．certain
D．any
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单项选择题
Mr. Morgan can be very sad ______ , though in public he is extremely cheerful.
A．by himself
B．in person
C．in private
D．as individual
单项选择题
______ it or no, his discovery has created a stir in scientific circles.
A．Believe
B．To believe
C．Believing
D．Believed
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