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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Is that a book on farming If so, I want to borrow ______.
A．this
B．one
C．it
D．the one
单项选择题
He hurried out of the classroom ______ the class was over.
A．a moment ago
B．the moment
C．at the moment
D．the moment that
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