单项选择题

He could not account ______ his foolish mistakes.

A．of
B．on
C．about
D．for
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The telephone rates ______ by 20 percent last year.
A．raised
B．aroused
C．arose
D．rose
单项选择题
We made several plans for our holiday, but we went to Xi'an ______ the end.
A．at
B．on
C．by
D．in
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