高一英语

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查看11 | 回复2 | 2011-3-14 21:20:38 | 显示全部楼层 |阅读模式
So fa,several cases of a disease,_____ as bird flu, are reported to have been found in the country.
A.knowing
B.to be known
C having known
D.known

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千问 | 2011-3-14 21:20:38 | 显示全部楼层
D省略 which is 修饰前面的disease
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