单项选择题

A．to
B．out
C．up
D．forward
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单项选择题
A．documentsB．presentationsC．referencesD．manuscripts
A．documents
B．presentations
C．references
D．manuscripts
单项选择题
A．SinceB．HoweverC．BecauseD．Due to
A．Since
B．However
C．Because
D．Due to
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