单项选择题

A．digits
B．forms
C．devices
D．menus
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单项选择题
A．ThereforeB．IndeedC．HoweverD．Nevertheless
A．Therefore
B．Indeed
C．However
D．Nevertheless
单项选择题
A．complexB．sophisticatedC．advancedD．difficult
A．complex
B．sophisticated
C．advanced
D．difficult
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