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
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单项选择题
We agreed to accept ______ they thought was the best tourist guide.
A．whatever
B．whomever
C．whichever
D．whoever
单项选择题
When he was a young man, he traveled about the world ______.
A．on its own
B．of its own
C．on his own
D．of his own
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