He was so _______ thought that he didn’t see the pole on the roadA.buried inB.careful withC.busy withD.serious about
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A解析试题分析：考查词组辨析：A.be buried in 埋头于B.be careful with对…细心C.be busy with忙于，D.be serious about对…认真，句意：他在专注的思考，没有注意到街上的杆子。选A。考点：考查短语辨析
点评：本题考查了形容词短语，在平时要加强识记和记忆。做题时要结合上下文判断。关键是句意，可以把句子翻译出来。