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
You are advised to rise with a yawn and stretch because it will ______.
A．help to keep your energy for the day's work
B．help you to control your temper early in the day
C．enable you to concentrate on your routine work
D．keep your energy cycle under control all day
单项选择题
I'm not ______ going to London.
A．thinking
B．thinking of
C．thinking about
D．thinking over
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