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People laugh at jokes, but seldom ________ about how they work.
A.they thinkB.think theyC.they do thinkD.do they think
D

试题分析:句意:人们觉得笑话好笑,但是很少有人想这些笑话是怎么起作用的。Seldom“很少”是否定词,放在句首的时候,句子用部分倒装,助动词do放在主语前面,所以选D。
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