2. 外语
  3. All the participants in the meeting______ a loud laugh when the lecturer began his speech with a joke.

All the participants in the meeting______ a loud laugh when the lecturer began his speech with a joke.

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问题 All the participants in the meeting______ a loud laugh when the lecturer began his speech with a joke.
选项 A、let off
B、let out
C、let down
D、let through
答案B
解析 动词词组辨析 B)1etout “发出(笑声、叫喊声)；泄露”；A)let off“说出(笑话等)；放过，饶恕”；C) let down“放下；使失望”，D)let through“允许…通过”。
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大学英语四级

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