单项选择题

Huntington and many of its competitors are working to make remedial instruction a commodity as ______ and accessible as frozen yogurt.

A．ubiquitous
B．rational
C．necessary
D．credible
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单项选择题
If they think they are going to win over us by obstinately ______ and refusing to make the shghtest concession, they are mistaken.
A．holding out
B．holding to
C．holding over
D．holding up
单项选择题
Danis Hayes raised the essential paradox and asked how people could have fought so hard against environmental degradation ______ themselves now on the verge of losing the war.
A．only found
B．finding only
C．only to find
D．have only found
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