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All students in the class_______ a loud laugh when the profe

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All students in the class_______ a loud laugh when the professor told them a joke.
A.let up B.let down C.let off D.let out
D

考查动词词组辨析。A)let up“停止,暂停”;B)let down“放松,松懈”:As his interest wore off,he began to let down. 随着兴趣的减弱,他开始松劲了。C)let off“宽恕;放(枪、炮、烟火等)”:let off fireworks放烟火;D)let out(1)“发出”:let out a cry of pain发出一声痛苦的叫声;(2)“出租”:let out cars by the day按天出租汽车。句意为:教授讲了一个笑话,班上的所有学生大笑起来。