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The number of __________is now estimated...

The number of __________is now estimated at about 200 billion.

A.existed stars B.existing stars C.stars into existence D.stars existent

 

B 【解析】 考查现在分词。句意:现存的恒星数量现在估计约有2000亿颗。分析可知,所填空应是名词短语,意为“恒星”。动词exist,意为“存在”,与stars之间为主动关系,可用其现在分词形式作为定语修饰名词stars组成,且单个词作定语,可放于名词之前。故选B项。  
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