The man sitting in front of me had a newspaper open in hand, which he was pretending to read, though all the time I could see that he ________ an eye on me．A.keptB.had keptC.was keepingD.keeps
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C解析考查动词时态。本局话的意思为“坐在我前面的人手里拿着一张展开的报纸，假装在读，然而我知道他在不断地监视我。”根据题干中all the time可以判断出本题强调keep an eye on me的动作“持续发生”，因此选C。