【題目】_________ that causes heavy haze sweeping over china remains unknown to many scientists.

A. what it is B. what is it

C. who is it D. who it is

【答案】A

【解析】

試題分析：考察強調(diào)句。該句是強調(diào)句的疑問句，陳述句應(yīng)該是it is … that cause heavy haze。又因為原因并沒有查明是人還是物，所以疑問詞用what。該句意思為：是什么導(dǎo)致了席卷中國的霧霾對于很多科學(xué)家來說還是未知的。

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