单项选择题

______ when the telephone rang

A．Were sleeping
B．Did you sleep
C．Have you slept
D．Were you sleeping
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单项选择题
You ______ me, did you
A．understood
B．weren't understanding
C．didn't understand
D．understand
单项选择题
Only in the Civil War ______ killed or wounded.
A．soldiers in America
B．were so many American soldiers
C．many in America
D．so many American soldiers were
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