---What’s wrong with you, Mr. Keller? --- I’ve had a very bad headache for two days. At first, I ______ I caught a cold, but the medicine ______A.thought, hasn’t workedB.had thought, didn’t workC.thought, hadn’t workedD.have thought, hasn’t worked
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B解析本题考查时态。根据句意可知我原以为我得感冒了，故用过去完成时，药没起作用为过去的事实，故用一般过去时。句意：——Keller先生，你怎么啦？——我头疼两天了。起初，我原以为我患感冒了，但服药没有效。