单项选择题

I would like to take this opportunity to express my sincere ______ of your help.

A．appreciation
B．appearance
C．preparation
D．appointment
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单项选择题
It is decided that he ______ for a bus to meet the guests from Beijing.
A．call
B．calls
C．arrange
D．arranges
单项选择题
You should observe carefully how the audience ______ his speech.
A．reach to
B．refer to
C．react to
D．relate to
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