单项选择题

21（）

A．at
B．in
C．above
D．of

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单项选择题
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
Five minutes earlier, ______ we could have caught the last train.
A．and
B．but
C．or
D．so
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