单项选择题


A．therefore
B．however
C．though
D．thereby
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单项选择题
A．requirementsB．preferencesC．tendenciesD．ambitions
A．requirements
B．preferences
C．tendencies
D．ambitions
单项选择题
A．ThereforeB．HoweverC．MoreoverD．Nevertheless
A．Therefore
B．However
C．Moreover
D．Nevertheless
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