单项选择题

You ______ yesterday if you were really serious about the job.

A．ought to come
B．ought come
C．ought have come
D．ought to have come
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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
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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