单项选择题

A．before
B．while
C．as
D．until
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单项选择题
A．in factB．in caseC．as a resultD．on the contrary
A．in fact
B．in case
C．as a result
D．on the contrary
单项选择题
A．ConsequentlyB．MoreoverC．UnexpectedlyD．However
A．Consequently
B．Moreover
C．Unexpectedly
D．However
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