单项选择题

This region ______as the costliest place to do business.

A． often is referred
B． is often referred
C． is referred often to
D． is often referred to
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单项选择题
The company was ______by an immigrant.
A． found
B． founding
C． find
D． founded
单项选择题
The manufacturer listed assets ______liabilities.
A． but
B． nor
C． and
D． so
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