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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I would never have believed it was possible if I ______ it with my own eyes.
A．didn't see
B．don't see
C．won't see
D．hadn't seen
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I am looking forward ______ Mike next week.
A．to see
B．to seeing
C．seeing
D．see
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