We laugh at jokes, but seldom __________ about how they work.
A．we thinkB．think weC．we do thinkD．do we think
D

試題分析：原句意思，我們因笑話而發(fā)笑，卻很少思考它們的作用。含有否定意義的副詞如no, never, little, seldom, hardly 等位于句首時，要將助動詞、情態(tài)動詞或系動詞放在主語前面，構(gòu)成部分倒裝。seldom 為否定副詞放句首，用部分倒裝。
點評：解答此類題，一定要區(qū)別是部分倒裝還是完全倒裝，部分倒裝是將助動詞、情態(tài)動詞或系動詞提在主語前面，而完全倒裝是把謂語動詞本身完全提到主語的前面。
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