单项选择题

It was very kind of you to do the washing-up, but you ______it.

A．mustn't have done
B．wouldn't have done
C．mightn't have done
D．didn't have to do
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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
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
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