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When did the presentation skills course begin

A．On Saturday
B．On Sunday
C．On Monday
D．On Friday
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单项选择题
We believe him to______a mistake.
A．have made
B．be made
C．have been made
D．making
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Not once______his view of life.
A．did Mr. Smith mention
B．Mr. Smith mentioned
C．Mr. Smith mentioned that
D．would Mr. Smith mention
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