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
A thief who broke into a church was caught because traces of wax, found on his clothes, ______from the sort of candles used only in churches.
A．had come
B．coming
C．come
D．that came
单项选择题
However, at times this balance in nature is______, resulting in a number of possibly unforeseen effects.
A．troubled
B．disturbed
C．confused
D．puzzled
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