单项选择题

Anne couldn't concentrate ______ what she was doing while her family were watching TV.

A．to
B．on
C．for
D．in
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单项选择题
______ she first heard of the man referred to as a specialist.
A．That was from Stephen
B．It was Stephen
C．It was from Stephen that
D．It was Stephen that
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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