(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
出自：黑龙江省教育学院口语(专升本)
提示：
每天可免费获取10次答案
收藏本站【zk.995w.com】，下次访问不迷路
本站试题总数:【10253414】个 (题库试题定时更新)
