单项选择题

Lisa was busy taking notes _________ Mark was searching the Internet for the information.

A．until
B．unless
C．while
D．if
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单项选择题
David has _________ much work to do that he is staying late at his office.
A．such
B．so
C．very
D．enough
单项选择题
My impression of the service in the hotel was that it had really_________.
A．imagined
B．implied
C．imported
D．improved
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