单项选择题

When climbing the hill, John was knocked unconscious by an______rolling stone.

A．untouched
B．unfamiliar
C．unexpected
D．unbelievable
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单项选择题
The president spoke at the business meeting for nearly an hour without______his notes.
A．bringing up
B．referring to
C．looking for
D．trying on
单项选择题
It is certain that he will______his business to his son when he gets old.
A．take over
B．think over
C．hand over
D．go over
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