单项选择题

The impact of Thoreau' s On the Duty of Civil Disobedience might not have been so far reaching ______ for Elizabeth Peabody, who dared to publish the controversial essay.

A．it not being
B．if it has not been
C．if it were not
D．had it not been
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单项选择题
Our visual perception depends on the reception of energy reflecting or radiating from ______ which we wish to perceive.
A．it
B．these
C．that
D．those
单项选择题
Some would consider such speech an infringement of good mariners whereas others would not.
A．an example
B．a violation
C．an insult
D．an indication
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