单项选择题

A．Since
B．Although
C．However
D．Before
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单项选择题
A．ObviouslyB．ContrarilyC．FrequentlyD．Practically
A．Obviously
B．Contrarily
C．Frequently
D．Practically
单项选择题
A．yetB．otherwiseC．evenD．though
A．yet
B．otherwise
C．even
D．though
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