单项选择题

A．Therefore
B．Indeed
C．However
D．Nevertheless
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单项选择题
A．complexB．sophisticatedC．advancedD．difficult
A．complex
B．sophisticated
C．advanced
D．difficult
单项选择题
A．soundB．competitionC．quarrelD．advertisement
A．sound
B．competition
C．quarrel
D．advertisement
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