单项选择题

After the guests left, she spent half an hour ______ the sitting-room.

A．ordering
B．arranging
C．tidying up
D．clearing away
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单项选择题
The British constitution is ______ a large extent a product of the historical events described above.
A．within
B．to
C．by
D．at
单项选择题
Unexpectedly the light ______ and we were left in darkness.
A．burned out
B．put out
C．turned out
D．went out
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