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
Scientists, like other people, are always pleased to have their own ideas ______.
A．validating
B．to be validated
C．validated
D．being validated
单项选择题
Wherever two or more unusual traits or situations are found in the same place, it is tempting to look for more than a coincidental relationship between them.
A．vestiges
B．residues
C．characteristics
D．figures
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