单项选择题

The cultural change in British science over the past five years means that-additional funding is now more important than ever ______ it is no longer required.

A．but that
B．not in that
C．or that
D．not that
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单项选择题
Among the many open research questions on MTBE are how it is metabolized, ______the levels of exposure in the general population are.
A．but what
B．and what
C．but how
D．and why
单项选择题
If the additives are ______, the University of California researchers recommended caution in approving any alternatives.
A．postponed up
B．phased up
C．phrased up
D．phased out
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