单项选择题

The Rocky Mountain goat of North America is not a tree goat _______ a goat antelope.

A．and
B．but
C．any
D．yet
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单项选择题
Outside my office window, there is fire _______ on the right.
A．ladder
B．escape
C．steps
D．stairs
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 having been
B．it is not being
C．had it not been
D．it it not being
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