The basic causes are unknown, although certain conditions that may lead to cance

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问题 The basic causes are unknown, although certain conditions that may lead to cancer have been ______.

选项 A、identified
B、guaranteed
C、notified
D、conveyed

答案 A

解析动词辨析。identify意为“确定”，guarantee意为“确保”，notify意为“通，报”，convey意为“传达”。

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