【題目】The number of __________is now estimated at about 200 billion.

A.existed starsB.existing starsC.stars into existenceD.stars existent

【答案】B

【解析】

考查現(xiàn)在分詞。句意:現(xiàn)存的恒星數(shù)量現(xiàn)在估計約有2000億顆。分析可知,所填空應(yīng)是名詞短語,意為“恒星”。動詞exist,意為“存在”,與stars之間為主動關(guān)系,可用其現(xiàn)在分詞形式作為定語修飾名詞stars組成,且單個詞作定語,可放于名詞之前。故選B項。

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