单项选择题


A．possible
B．appropriate
C．relevant
D．available
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单项选择题
A．MoreoverB．UnlessC．HoweverD．Although
A．Moreover
B．Unless
C．However
D．Although
单项选择题
A．AlthoughB．SinceC．BecauseD．Therefore
A．Although
B．Since
C．Because
D．Therefore
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