单项选择题

We recognized his voice______ he spoke on the radio.

A．while
B．after
C．in case
D．the moment
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单项选择题
I was half way back to the cottage where my mother lived ______Susan caught up with me.
A．before
B．where
C．when
D．that
单项选择题
The palace was heavily guarded, because inside its walls ______.
A．where lived the Queen
B．lived the Queen
C．there lived the Queen
D．that lived the Queen
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