______ proves that Jack is really enthusiastic and cautious.
A．It happened thatB．When it happenedC．What happenedD．That has happened
C

試題分析：考查主語從句。本題中的what引導起一個主語從句what happened，在句中做主語。句意：發(fā)生的事情證明Jack真的很熱情很謹慎。故C正確。That在主語從句中不充當任何成分。A項意為碰巧。B項不能做主語。
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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