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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The Internet has brought ______ big changes in the way we work.
A．about
B．out
C．back
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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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