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外语
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 ______.
admin
2011-05-29
43
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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