单项选择题

Often such arguments have the effect of ______ rather than clarifying the issues involved.

A．blocking
B．obscuring
C．tackling
D．prejudicing
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单项选择题
All flights ______ because of the terrible weather, they had to go there by train.
A．having been canceled
B．had been canceled
C．having canceled
D．were canceled
单项选择题
Others viewed the findings with ______, noting that a cause-and-effect relationship between passive smoking and cancer remains to be shown.
A．caution
B．passion
C．optimism
D．deliberation
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