单项选择题

I was almost asleep last night when I suddenly heard someone__________ at the door.

A．be knocking
B．knocking
C．to knock
D．having knocked
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单项选择题
It wasn't such a good job__________ she had read about in the advertisement.
A．like
B．which
C．as
D．what
单项选择题
Once more I have to leave Beijing, __________I have been living for eight years.
A．that
B．where
C．which
D．as
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