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

游客2025-05-05 16

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 identify意为：识别，认出；guarantee保证，使确信；notify通知，告知；convey传递，传达(信息或消息等)。句意：致癌的根本原因还不清楚，可是已经发现某些导致癌症的情况。

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