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______is known to us all is that Johnson broke his promise ______ he would e to help me as soon as possible. A.第一空是主語從句,從句中缺主語,要用What;第二空是表語從句,從句不缺成分,所以要填that;第三空是賓語從句,從句中的動詞understand缺賓語,要填what。D.C.B.t understand ________ he said A.故選B。when10.Exactly _________ the potato was introduced into Europe is uncertain, but it was probably around 1565. A.根據(jù)語境用what引導主語從句,并在句中做主語。第一空what作主語從句的主語;第二空為表語從句的that。C.it。 that故選A。D.What。 that【點評】考查名詞性從句,本題涉及whether引導的主語從句的應用。Whethert matter a lot to our success. A.What引導主語從句______ I call my “home”且whatB.5.Located between the 16th and the 18th floor, ______ I call my “home” is more like a “bird39。where are the planes to take offwhen are the planes to take off whether。C. whether。the earth cooled down, water began to appear on its surface.A. is clear to the members of the mittee這是主語從句,這里缺少主語從句的連接詞,并且連接詞在句中作主語,it是代詞,不是了;連接詞,故排除B;as作主語時,是在定語從句中,故排除C;who指人,根據(jù)表語指的事情,不是人,故排除A;what在主語從句中可以作主語或賓語,指事,符合句意,故選D。D.Who2.D.B.AsIt 【點評】考查名詞性從句,本題涉及what引導的主語從句。is clear to the members of the mittee is that the President will not give in to their demands. A.Itis even more important is whenWhat。 aslt。4.Has it been announced ______? A.that are the planes to take offC.【點評】考查名詞性從句,it作形式主語,關系副詞when引導的從句作真正的主語。C.where【答案】 C 【解析】【分析】考查主語從句。6.____ he will offer us enough help doesn39。B.BeforeIf不可以引導主語從句,故選B。 thatThat 。C.第一空填what,它一方面在句子中引導主語從句,另一方面又在主語從句中作主語;第二空用that引導表語從句且從句中不缺成分,表示對前面情況的說明。what。B. because【答案】 A 【解析】【分析】考查名詞性從句的連接詞。A. why為什么;B. that引導名詞性從句只起引導詞作用,不充當成分;C. which哪一個;D. What什么。主語從句屬于名詞性從句的一種,填哪個連接詞要分析從句缺少什么成分,然后確定所選的詞。B.why根據(jù)時間狀語round 1565得知這里是指時間不確定。11._______ is troubling me is ______ I don39。 what what wha