单项选择题

These proposals sought to place greater restrictions on the use and copying of digital information than in traditional media.

A．exist
B．exists
C．existing
D．to exist
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单项选择题
Einstein was a man of uncommonly intelligence. He discovered what fewpeople could do.
A．abnormal
B．abrupt
C．accurate
D．acute
单项选择题
I felt somewhat disappointed and was about to leave, something occurred which attracted my attention.
A．unless
B．when
C．until
D．while
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