单项选择题

The fire was finally brought under control, but not ______ extensive damage had been caused.

A．before
B．since
C．agar
D．as
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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
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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