问题
选择题
At the party, John made up a joke, people burst out laughing.
A．on which
B．by which
C．at which
D．from which
答案
答案：C
本题考查定语从句。句中先行词为a joke，介词at表示“听到”之意，故用at which。句意：在晚会上John编了一个笑话，听到的人们大笑起来。
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