单项选择题

Not until the game had begun ______ at the sports ground.

A．had he angled
B．would he have arrived
C．did he arrive
D．should he have arrived
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单项选择题
Agriculture was a step in human progress ______ which subsequently there was not anything comparableuntil our own machine age.
A．to
B．in
C．for
D．from
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
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