32．Little about A-H1N1 so far, so there is no doubt that many people are afraid when talking about the disease. A．did scientists know B．scientists have known C．have scientists known D．had scientists known 【查看更多】
题目列表(包括答案和解析)
Little _____ about A-H1N1 so far, so there is no doubt that many people are afraid when talking about the disease.
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A. did scientists know B. scientists have known C. have scientists known D. had scientists known
