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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
2014-01-13
53
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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考博英语
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