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Little_____ about A-H1N1 so far, so ther...

Little_____ about A-H1N1 so far, so there is no doubt that many people are afraid when talking about the disease.

A. did scientist know     B. scientists have known

C. have scientists known   D. had scientists known

 

C... 【解析】 试题分析:句意:到现在为止,科学家们对甲型H1N1了解甚少,因此当人们谈论这种疾病时,毫无疑问充满了恐慌。否定副词位于句首,后面谓语用部分倒装, 根据后面动词一般现在时时态,得知与现在时有关,用现在完成时。排除A. 一般过去时。D. 过去完成时。故选C.。 考点:考查倒装句的用法。  
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