◎ 题干
--I hear this kind of CD-ROM is very popular.
--Let’s buy one before it ____________.
A.is come outB.comes outC.sells outD.is sold out
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“--I hear this kind of CD-ROM is very popular.--Let’s buy one before it ____________.A.is come outB.comes outC.sells outD.is sold out…”主要考查了你对  【实义动词的单数第三人称形式】【实义动词】【动词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。