单项选择题

In order not to be disturbed, I spent three hours______ in my study.

A．locking
B．locked
C．to lock
D．being locked
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单项选择题
We recognized his voice______ he spoke on the radio.
A．while
B．after
C．in case
D．the moment
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
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