单项选择题
______ the most versatile of the common metals, lead was widely valued and used in ancient times.
A．It is
B．Therefore
C．Among
D．Because
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单项选择题
Not only the switches but also the old wiring ______ changed.
A．have
B．are
C．have been
D．has been
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单项选择题
So quickly ______ their work that they were given a bonus.
A．did the workmen finish
B．the workmen finished
C．the workmen finish
D．do the workmen finish
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