单项选择题

Five minutes earlier, ______ we could have caught the last train.

A．and
B．but
C．or
D．so
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The car crashed into the train, and the driver was killed ______ the spot.
A．on
B．at
C．to
D．by
单项选择题
______ determines a good meal varies from country to country.
A．What
B．That
C．It
D．Which
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