—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
C
從題意來看，她在辦公室里工作，卻沒有被找到，實際上是應(yīng)該找得到的，表示應(yīng)該能做到某事而未能做到，用ought to(或should)+動詞的完成式，結(jié)合本題的選項應(yīng)選C。
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