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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

試題分析：句意：人們覺得笑話好笑，但是很少有人想這些笑話是怎么起作用的。Seldom“很少”是否定詞，放在句首的時候，句子用部分倒裝，助動詞do放在主語前面，所以選D。
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