单项选择题

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

A．of
B．but
C．and
D．so
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单项选择题
With the guide ______ the way, we set out on foot into the dark night.
A．lead
B．leading
C．led
D．to lead
单项选择题
The roof fell ______ he had time to dash into the room to save his baby.
A．since
B．as
C．before
D．until
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