Peak oil critics have often questioned the IEA figures.

石油峰值论的批评人士常常质疑IEA公布的数据。

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Critics have often questioned both firms' technological prowess.

批评者常常质疑这两家企业的技术实力。

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To a successor who has often questioned the reality of climate change, Mr. Obama seemed to say: Be careful.

对这位经常质疑气候变化真实性的继任者，奥巴马似乎在说：要小心。

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Bloomberg's news conference also coincided with a civil trial challenging the constitutionality of one of the city's strategies for taking guns off the street, a tactic known as "stop and frisk" in which officers have halted, questioned and often searched hundreds of thousands of mostly innocent people.

WSJ: Mayor: Fight crime by being more like NYC

For now pensions are on notice that consultants are often conflicted and should be questioned about these conflicts.

FORBES: Consequences of the Mutual Fund Industry's History of Transgressions (November 1, 2003 )

Some non-governmental organisations working in the field have accused him of often acting unilaterally and have questioned his commitment to longer-term projects.

BBC: Profile: Jimmy Carter