单项选择题

（）arriving at the burning building, the fire fighters at once joined the local residents in the fight against-the big fire.

A．On
B．For
C．At
D．In

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单项选择题
The drunken husband knocked against the table and sent the bowls（）in all directions before he was sent（）by his wife.

A．flying; to sleep
B．flying; sleeping
C．to fly; to sleeping
D．to fly; to sleep
单项选择题
Last night someone rang me up at midnight, but he hung up（）I could answer the phone.

A．before
B．as
C．until
D．after
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