单项选择题

A．student’s
B．professor’s
C．assistant’s
D．librarian’s
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单项选择题
A．HoweverB．ThereforeC．FurthermoreD．Nevertheless
A．However
B．Therefore
C．Furthermore
D．Nevertheless
单项选择题
A．particularlyB．essentiallyC．obviouslyD．rarely
A．particularly
B．essentially
C．obviously
D．rarely
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