◎ 题干
Mr. Richard was disappointed that many students who had signed up for his adventure course _______ at the last moment.
A.left outB.got outC.passed outD.dropped 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“Mr. Richard was disappointed that many students who had signed up for his adventure course _______ at the last moment.A.left outB.got outC.passed outD.dropped …”主要考查了你对  【动词短语】【动词】  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。