单项选择题

Limestone that can be highly polished is _______ marble.

A．substituted by
B．known as
C．regular as
D．improved by
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单项选择题
The tour of our country by the foreign visitors _______ on the Great Wall and other historical spots.
A．confirmed
B．focused
C．instructed
D．hampered
单项选择题
You may be able to _______ extra compensation if you suffer loss from a faulty buy.
A．call
B．aspire
C．claim
D．proclaim
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