单项选择题

A great many cancers can be cured but only if ______ before they have begun to spread or "colonize" in other parts of the body.

A．properly treat
B．properly treating
C．being properly treated
D．properly treated
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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
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
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