_____ is certain is ______ the mystery of Stonehenge has never been fully explained.

A．It, thatB．What, what
C．It, whatD．What, that

D

解析試題分析：考查名詞性從句。本題第一空what引導的是主語從句what is certain，在句中做主語。第二空that引導的是表語從句，that在表語從句中不充當任何成分，只起引導的作用。句意：確定的事情是巨石陣的秘密到現(xiàn)在為止還沒有被完全解釋。故D正確。故D正確。
考點：考查名詞性從句
點評：名詞性從句的考查集中在引導詞的選擇上，連接詞that, whether, if在句中不充當任何成分，只起連接作用；連接代詞who(ever), which(ever), whom(ever),whose(ever),what(ever)在句中做主語，賓語，表語和定語；連接副詞when, why, where, how，在句中做狀語。應(yīng)從上下句的句法關(guān)系著手分析，切不可‘望句形生答案’總的來說，考生在解答此類型時，可用排除法或造句法，造句法就是仿造原句的語法功能仿造出一個易懂易理解的句子，幫助判斷。

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