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The cause of this kind of flu hasn’t yet______in spite of the efforts of the medical researchers.
The cause of this kind of flu hasn’t yet______in spite of the efforts of the medical researchers.
admin
2016-11-25
26
问题
The cause of this kind of flu hasn’t yet______in spite of the efforts of the medical researchers.
选项
A、have discovered
B、discovered
C、been discovered
D、discover
答案
C
解析
现在完成时+被动语态。
转载请注明原文地址:https://kaotiyun.com/show/h4HC777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
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