We laugh at jokes，but seldom____________about how they work．
A．we thinkB．think weC．we do thinkD．do we think
D
考查倒裝。句中否定詞seldom放在句首，主句的主謂用倒裝結(jié)構(gòu)，故選D。句意：笑話我們都笑了，但我們很少考慮他們是怎么奏效的。
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