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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单项选择题
______ the whole story, Jane decided not to see the film.
A．Having been told
B．Having told
C．Been told
D．Telling
单项选择题
The tomato juice left brown _____on the front of my jacket.
A．spot
B．point
C．track
D．trace
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