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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】

試題分析：句意：到現在為止，科學家們對甲型H1N1了解甚少，因此當人們談論這種疾病時，毫無疑問充滿了恐慌。否定副詞位于句首，后面謂語用部分倒裝， 根據后面動詞一般現在時時態(tài)，得知與現在時有關，用現在完成時。排除A. 一般過去時。D. 過去完成時。故選C.。

考點：考查倒裝句的用法。

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