问题
选择题
We laugh at jokes,but seldom ________ about how they work.[ ]
A. we think
B. think we
C. we do think
D. do we think
答案
答案：D
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We laugh at jokes,but seldom ________ about how they work.[ ]
A. we think
B. think we
C. we do think
D. do we think
答案：D