单项选择题

That community must now lead extensive reform of the region's universities and scientific institutions, rather than ______ against it.

A．entrench
B．entrench themselves
C．may entrench
D．may entrench themselves
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单项选择题
Today's scientists are no longer constrained simply by the laws of nature, ______ in the past, but also by the laws (and attitudes) of the land.
A．as generally the case
B．as was generally the case
C．as long ago
D．as expected
单项选择题
In the service of knowledge, scientists also train the most skilled component of the work force ______ to the employers.
A．in no cases
B．in a case
C．at no cost
D．at a cost
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