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


  1. A.
    let up
  2. B.
    let down
  3. C.
    let off
  4. D.
    let out
D
考查動(dòng)詞詞組辨析。A)let up“停止，暫停”；B)let down“放松，松懈”：As his interest wore off,he began to let down. 隨著興趣的減弱，他開始松勁了。C)let off“寬��；放（槍、炮、煙火等）”：let off fireworks放煙火；D)let out（1）“發(fā)出”：let out a cry of pain發(fā)出一聲痛苦的叫聲；（2）“出租”：let out cars by the day按天出租汽車。句意為：教授講了一個(gè)笑話，班上的所有學(xué)生大笑起來。
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All students in the class_______ a loud laugh when the professor told them a joke.

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A
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Dear editor,
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Yours truly,
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