单项选择题

I am writing ____ my mother to express her thanks for your gift.

A．in memory of
B．on behalf of
C．with respect to
D．on account of
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单项选择题
By 1929, Mickey Mouse was as popular ____ children as Coca Cola.
A．for
B．with
C．to
D．in
单项选择题
Professor Smith is also the ____ of the international program office. If you have any problem when you study here, you may go to him for help.
A．detective
B．president
C．manager
D．director
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