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名詞性從句,本題涉及why引導的主語從句。It在句中是形式主語,真正的主語是why引導的主語從句。D.whenB.that18.It was never clear ________ the man hadn39。復合句的主語是一個名詞性從句,從句沒有引導詞和主語,表示“所……的(事)”,故用what引導,其雙重作用,故選B。D.C.B.17._________ is known to all is that the earth is smaller than the sun. A.固定句式:主+find+it+adj+to do,主語發(fā)現(xiàn)做某事是……的,故選C。D.C.B.it39。 【點評】考查名詞性從句,本題涉及what引導的主語從句。 D.C.B.is known to all is that the earth is smaller than the sun. A.15. what he said做主語,主語從句中said缺賓語用what補足,故選B。 that【答案】 B 【解析】【分析】句意:正是他說的話讓我很失望。D.that。 thatB.that。 he said 【點評】考查名詞性從句,本題涉及that引導的主語從句。分析句子可知,整個句子為主系表結構,was為系動詞,它之前的都為主語,且主語由句子來充當,句子結構以及句意完整,所以連詞代詞為that。Being the sun and not the earthD.s the sun and not the earthB.13.________ is the centre of our planetary system was a difficult concept to grasp in the Middle Ages. A. ...是表語從句,從句中不缺少成分,因此用引導詞that; ______seemed to be the most difficult exam to him. 是賓語從句,從句中缺少主語,因此用關系代詞what , 故選B。 ______excited Jenny most是主語從句,從句中缺少主語,因此用關系代詞what ; because。D. because。C. that。B. that。12.______excited Jenny most was ______ she finally succeeded in ______seemed to be the most difficult exam to him. A.【點評】考查主語從句的引導詞。根據(jù)語境用what引導主語從句,并在句中做主語。What【答案】 D 【解析】【分析】句意:學習英語中最重要的是有足夠的練習。WhichThatWhy【點評】考查it的用法,以及主語從句的應用。that引導的是主語從句,故空格處應該用it作形式主語,代替真正的that引導的主語從句。D.C.B.10.______ is our belief that improvements in health care will lead to a stronger, more prosperous economy. A.此處是主語從句做主語,從句沒有引導詞,缺少賓語,故答案為B。D.C.B.9.________ we may find interesting is that it usually takes more to be polite. A.根據(jù)句意可知,句子主語是一個主語從句,引導詞即起引導作用又要做從句的一個成分,所以第一空填What;第二空是that引導的表語從句,只起引導作用,故選B。D.C.B.8.______ amazed the NBA world is ______ Kobe Bryant scored 81 points just in one game. A. because【答案】