单项选择题

Agriculture was a step in human progress ______ subsequently there was nothing comparable until our own machine age.

A．to which
B．signal
C．from which
D．in which
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单项选择题
The change in the treatment of his characters is a significant ______ to Shakespeare's growth as a dramatist.
A．label
B．signal
C．mark
D．index
单项选择题
I found seated at the table opposite to mine another guest. He was a decently unsociable man, anxious to ______ alone.
A．leave
B．be leaving
C．be left
D．have left
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