单项选择题

The board of directors believed it urgent that the files ______ right away.

A．had to be printed
B．should have been printed
C．must be printed
D．should be printed
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单项选择题
______ these questions may sound specific, answers to them could have profound economic and political significance.
A．Since
B．Unless
C．Lest
D．While
单项选择题
We agreed to accept ______ they thought was the best tourist guide.
A．whatever
B．whomever
C．whichever
D．whoever
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