---I didn’t see her yesterday,I looked for her everywhere,but couldn’t find her.---Oh,but you______.She was working in the office.A.must haveB.ought toC.ought to haveD.can’t have
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C解析从题意来看，她在办公室里工作，却没有被找到，实际上是应该找得到的，表示应该能做到某事而未能做到，用ought to(或should)+动词的完成式，结合本题的选项应选C。