题目内容

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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