单项选择题

____ , I'm busy at the moment. Can I call you back latter

A．Luckily
B．Theoretically
C．Generally
D．Actually
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单项选择题
Sometimes, to admit ____ something wrong is not that difficult.
A．doing
B．having done
C．to have done
D．to do
单项选择题
One of the first known methods of advertising is the outdoor ____ .
A．display
B．Journey
C．exercise
D．adventure
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