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
The bank is reported in the local newspaper _________ in broad daylight yesterday.
A．robbed
B．to have been robbed
C．being robbed
D．having been robbed
单项选择题
If this kind of fish becomes _________ , future generations may never taste it at all.
A．scarce
B．minimum
C．short
D．seldom
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