单项选择题

This edition is rare. I have never seen ______ before.

A．so edition
B．such edition
C．such an edition
D．so an edition
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How long did the baseball game______
A．last
B．endure
C．survive
D．continue
单项选择题
I ______ since seven this morning.
A．had typed
B．typed
C．am typing
D．have been typing
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