单项选择题

A．Up till
B．Up in
C．Up with
D．Up to
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单项选择题
A．BecauseB．SinceC．OnceD．While
A．Because
B．Since
C．Once
D．While
单项选择题
A．were controlledB．were storedC．were copiedD．were examined
A．were controlled
B．were stored
C．were copied
D．were examined
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