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

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

选项 A、properly treat
B、properly treating
C、being properly treated
D、properly treated

答案D

解析
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