单项选择题

We are living in an age ______ many things are done on computer.

A．which
B．that
C．whose
D．when
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单项选择题
Can you tell me the difference ______ these three words
A．between
B．among
C．of
D．with
单项选择题
Barbara did not have time to go to the concert last night because she was busy ______ for her lecture.
A．to preparing
B．to be prepared
C．preparing
D．being prepared
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