All students in the class ______ a loud laugh when the professor told them a joke.

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问题 All students in the class ______ a loud laugh when the professor told them a joke.

选项 A、let up
B、let down
C、let off
D、let out

答案D

解析 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—声痛苦的叫声;(2)“出租”:let out cars by the day按天出租汽车
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