The kindergartener sat them down to read and paint, all the children wanted to do was to

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A. as
B. then
C. until
(答案→)D. while
解析：考查句意为：幼儿园老师让他们坐下来读书绘画，然而孩子们想做的就是搞成乱糟糟的一团。as 方式状语，正如---一样；既然；当---时候；then adv 那时；until 直到---时候；while 然而，虽然，尽管。故答案为D。