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l a question.A. whetherfocused。C. whetherhas focused。根據(jù)In the past decade,在最近的幾十年里,可知句子用現(xiàn)在完成時態(tài),our education system是句子的主語,單數(shù)形式,所以第一空填has focused;第二空是主語從句做主語,if是否,不能引導主語從句,所以第二空填whether?!军c評】主語從句主要有三類:1)(1)由連詞that引導的主語從句:引導詞that無含義,在句中不做成分,不可以省。(2)用連詞 whether 引導的主語從句:whether有含義(是否),在句中不做成分,不可以省。t matter too 。2)用連接代詞引導的主語從句(在由連接代詞who, whose, whom, which, what, whoever, whomever, whichever, whatever引導的名詞性從句中,其連接代詞在句中起名詞性作用,擔當一定成分).例如:What you need is more 。)例如:Where we should leave it is a problem.8.Located between the 16th and the 18th floor, ______ I call my “home” is more like a “bird39。whichB.whatD.What引導主語從句______ I call my “home”且故選C。t matter a lot to our success. A.WhetherC.How【答案】 B 【解析】【分析】句意:他是否提供幫助對于我們的成功沒有什么關系。【點評】考查名詞性從句,本題涉及whether引導的主語從句的應用。what。B. thatit。D. because【答案】 A 【解析】【分析】考查名詞性從句的連接詞。11.They lost their way in the forest, and ___ made matters worse was that night began to fall.A.B.C.D.AC兩項不能引導主語從句,which在引導名詞性從句的時候總是含有疑問的語義,而本句中并沒有疑問的語義。故D正確。WhyThatWhichWhat【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。根據(jù)語境用what引導主語從句,并在句中做主語。【點評】考查主語從句的引導詞。13.Exactly _________ the potato was introduced into Europe is uncertain, but it was probably around 1565. A.whenC.how【答案】 B 【解析】【分析】句意:土豆被引進歐洲具體的事件不被確定,但是可能是在1565年左右。故選B。 s first spacewalk successful. A. whatB. whichC. whichD. that【答案】 B 【解析】【分析】句意:眾所周知,中國已經(jīng)發(fā)射了神州7號宇宙飛船,這是中國首次成功的太空行走。故選B。15.______ makes the school proud is ______ more than 90% of the students have been admitted to universities. A. becauseB. becauseC. whatD. that【答案】 D 【解析】【分析】句意:讓學校驕傲的是,超過90%的學生被重點大學所錄取。第二空為表語從句,且從句中不缺少成分,故填關系詞that。 【點評】考查名詞性從句,本題涉及what引導的主語從句和that引導的表語從句。How to doWhat to do nextTo do whatTo do how【答案】 B 【解析】【分析】句意:接下來做什么還沒有決定。 【點評】考查名詞性從句,識記名詞性從句做主語的用法。It39。The sun and not the earthC.That the sun and not the earth【答案】 D 【解析