单项选择题

Let me ______ the broken glass before someone walks on it.

A．cover up
B．clear up
C．wash up
D．spring up
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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
单项选择题
Nobody knows, ______
A．does nobody
B．does one
C．does he
D．do they
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