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
You should observe carefully how the audience ______ his speech.
A．reach to
B．refer to
C．react to
D．relate to
单项选择题
The bird flew into the air and was soon ______ .
A．out of sight
B．in a hurry
C．at a loss
D．for good
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