◎ 题干
All students in the class_______ a loud laugh when the professor told them a joke.
A.let up B.let down C.let offD.let 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“All students in the class_______ a loud laugh when the professor told them a joke.A.let up B.let down C.let offD.let out…”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。