Sentence examples for challenged is that from inspiring English sources
An alternative auction for the financially challenged is "That Lunch With Murdoch: The Whole Story," an insightful e-book being flogged by a peddler known only as the_struggling_artist.
One reason why biomonitoring studies have been challenged is that toxicokinetic studies, in which known quantities of BPA are administered under controlled circumstances, suggest that very large oral doses are required to produce circulating blood levels of uBPA above the limits of detection of current methodologies [ 41, 78].
And I say "come up with", rather than "written", because one of the conventions challenged is that of authorship.
About the only one of Cohen's statements that can't be challenged is that combining Comcast and Time Warner won't directly reduce the level of competition in many localities.
What must be challenged is that instruments intended to enhance security will clearly have a major negative impact on those who are most at risk.
The second misconception that must be challenged is that being an entrepreneur just means selling cakes at the side of the road and barely making ends meet.
How challenging was that?
One assumption he challenged was that downtown Oakland was overbuilt.
SE: I think what's challenging is that it's art and science.
2. The second perspective we challenge is that networks are horizontal, non-hierarchical structures [ 45].
A more stringent revegetational challenge is that following strip-mining.
