单项选择题

A．at a loss
B．at last
C．in fact
D．on the occasion
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单项选择题
A．SinceB．AlthoughC．HoweverD．Before
A．Since
B．Although
C．However
D．Before
单项选择题
A．ObviouslyB．ContrarilyC．FrequentlyD．Practically
A．Obviously
B．Contrarily
C．Frequently
D．Practically
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