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

解析动词词义辨析。根据句中转折连词although判断，空格应填入与unknown意思相对的词。选项中，identified意为“识别，认出”，符合要求。故答案为A。

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Executionbylethalinjection,althoughhorrifying,iscertainlymorecivilized