单项选择题

Gold has been highly prized throughout the ages due chiefly to

A．it is scarce
B．so scarce is it
C．its scarcity
D．scarcity of it
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单项选择题
They ______ us warmly and showed us to our rooms.
A．welcome
B．welcame
C．welcomed
D．welcamed
单项选择题
______ the knowledge, he didn't know how to ask the way.
A．Knowing not
B．Having not known
C．Not knowing
D．Not to know
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