8．Although it remains unclear to this day ______ The Library of Alexandria was destroyed，the leading theory is that Julius Caesar set a fire that unintentionally burned it down．（　�。�
A．whetherB．howC．ifD．why

分析 盡管至今亞歷山大圖書館是如何被摧毀的仍不清楚，但是主要的理論認(rèn)為尤利烏斯•凱撒放火無意中燒毀了它．

解答 答案：B．根據(jù)后面一句the leading theory is that Julius Caesar set a fire that unintentionally burned it down可知整句在說亞歷山大圖書館是如何被摧毀的，故選B．how，A．whether 是否，C．if是否；如果，D．why 為什么．

點(diǎn)評(píng) 本題考查疑問詞的辨析．根據(jù)句意及上下文選擇合適的疑問詞．

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