单项选择题

We ______ our breakfast when an old man came to the door.

A．just have had
B．just had
C．have just had
D．had just had
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单项选择题
I missed the morning train because I slept ______ .
A．over
B．of
C．in
D．through
单项选择题
______ what to do, the man telephoned the police.
A．Not known
B．Not knowing
C．Don't know
D．Knowing not
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