Before an exam, I always my notebook. A. look upB. look afterC. look forD. look through

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A. look up
B. look after
C. look for
(答案→)D. look through
解析：look up向上看，查阅； look after 照顾，关心；look for 寻找；look through浏览，温习，仔细查看。句意：在考前，我总是仔细查看我的笔记本。故选D。