单项选择题

______you're early you can't be sure of getting a seat.

A．If
B．Unless
C．When
D．Because
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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
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
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