11.(2014·烟台高一检测) Steve Jobs has gone but ______ he has left behind is truly extraordinary.
A.that B.why
C.what D.how
答案：C 分析句子结构可知，“________he has left behind”是主语从句，且关系代词在从句中作宾语，故选what。
12.(2014·天津，14)I think ________ impress me about his painting is the colours he uses.
A.what B.that
C.which D.who
答案：A 考查名词性从句。句意：我认为关于他的绘画让我印象深刻的是他使用的颜色。impresses缺少主语，故用what引导名词性从句;that引导名词性从句，不作成分。
13.(2014·泰安高一检测)__________ is known to all is ________ we won 38 gold medals in 2012 London Olympic Games.
A.It; that B.As; what
C.What; that D.That; what
答案：C 句意：众所周知，2012年伦敦奥运会上我们赢得了38枚金牌。________is known to all是主语从句，从句中缺少主语，意为“所……的”，应由what引导;第二个is后的部分是表语从句，且从句表陈述意义，应由that引导，且不可省略。故选C。
14.________ seems to be no possibility ________ Li Hua can win the first prize in the 100meter race.
A.It; that B.There; that
C.There; whether D.It; whether
答案：B There seems to be是固定表达;第二个空填that，引导同位语从句补充说明possibility的具体内容。故选B。
15.Why and how he came here ________ yet.
A.is not known B.are not known
C.has not known D.have not been known
答案：A 句意：他为什么及如何来这儿还不知道。Why and how引导的从句主语，谓语动词用单数，且不被知道，故选A。
