All students in the class_______ a loud laugh when the professor told them a joke.
A．let up B．let down C．let offD．let out
D
考查動詞詞組辨析。A)let up“停止，暫�！�；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�。环牛�、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：教授講了一個笑話，班上的所有學生大笑起來。
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