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题目内容
（黑龙江省教育学院口语(专升本)）
(单选题) The basic causes are unknown , although certain conditions that may lead to cancer have been .(本题4.0分)
A、 Guaranteed
B、 identified
C、 Notified
D、 conveyed
A、 Guaranteed
B、 identified
C、 Notified
D、 conveyed
参考答案
