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

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、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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