29. A mirage is an atmospheric optical illusion in what an observer sees a nonexistent body of water or an image of some object.
答案:B
但这里最后的object为何不用复数形式呢?
举报
some object:某些物体.
分析:in what->in which.后边的从句不缺任何成分,所以我们需要一个副词性质的引导词,
in what=in the thing which,显然这里which就多余了
some object 是指某一个物体,,所以单数~
an image of some object.粉色的字也有提示~
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