单项选择题

Agriculture was a step in human progress ______ which subsequently there was not anything comparable
until our own machine age.

A．to
B．in
C．for
D．from
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单项选择题
Professor Hawking is ______ ms one of the world's greatest living physicists.
A．dignified
B．clarified
C．acknowledged
D．illustrated
单项选择题
As Commander-in-Chief of the armed forces, I have directed that all measures ______. for our defense.
A．had been taken
B．would be taken
C．be taken
D．to be taken
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