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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

D


解析:

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(kāi)始松勁了。C)let off“寬恕;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(chē)。句意為:教授講了一個(gè)笑話,班上的所有學(xué)生大笑起來(lái)。

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