The basic causes are unknown although certain conditions that may lead to cancer have been

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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、conveyed
D、notified.

答案A

解析 identify“识别，鉴别”；guarantee“保证”；convey“运送；传达”；notify“通知”。题句意为：“虽然导致癌症的某些条件已经鉴别出来，但是根本的原因还不得而知。”

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