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

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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大学英语四级

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