单项选择题

A．student’s
B．assistant’s
C．professor’s
D．librarian’s
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单项选择题
A．IfB．BecauseC．AlthoughD．Before
A．If
B．Because
C．Although
D．Before
单项选择题
A．HoweverB．ThereforeC．FurthermoreD．Nevertheless
A．However
B．Therefore
C．Furthermore
D．Nevertheless
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