All students in the class a loud laugh when the professor told them a joke. A． let up B． let down C．let off D．let out 题目和参考答案——青夏教育精英家教网—

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

A． let up B． let down C．let off D．let out

解析:

考查动词词组辨析。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发出一声痛苦的叫声；（2）“出租”：let out cars by the day按天出租汽车。句意为：教授讲了一个笑话，班上的所有学生大笑起来。

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