单项选择题

How long did the baseball game______

A．last
B．endure
C．survive
D．continue
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单项选择题
I ______ since seven this morning.
A．had typed
B．typed
C．am typing
D．have been typing
单项选择题
I could have done it for you if you______.
A．ask me to
B．asked me to
C．have asked me to
D．had asked me to
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