单项选择题

______ of the department, I would like to thank Mr. Jones for his stimulating lecture.

A．On behalf
B．On account
C．In person
D．Instead
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It's a shame ______ able to give them any advice.
A．not to have been
B．to have not been
C．to have been not
D．to not have been
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The snow seems to have set ______ for the evening.
A．upon
B．in
C．about
D．down
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