语法结构练习（复合句）A．Fillineachofthefollowingblankswithasuitableconnective．1．_________thechairmandeclaredtheCongressopen，thebandplayedtheNationalAnthem．A．SinceB．AfterC．WhileD．As2．Iwaited_________shecameback．A．whileB．untilC．ifD．or3．Theysetoutearly_________theymightarrivethereintime．A．whenB．whichC．whatD．sothat4．_________Iamconcerned，heknowsnothingaboutit．A．WhatB．AswellasC．ButD．Asfaras5．Nosoonerdidtheygettothefields_________theystartedtowork．A．whenB．thenC．thanD．and6．_________weareverycareful，wecan'tdoourworkwell．A．WhetherB．WhenC．UnlessD．Aslongas7．____thebellrang，theschoolchildrenrushedintotheirclassroom．ThemomentB．allA．BeforeC．soonerD．NoIf8．Thefirstthing_________weshalldoistoworkoutaplan．A．whichB．whatC．thatD．when9．_________hewillcometothediscussioniscertain．A．HowB．WhenC．ThatD．Where10．Agashasneitherfixedsize_________shape．A．orB．norC．andD．aswellas11．hasbeen50years_________IgraduatedfromBenjaminFranklinHighSchoolinEastHarlem．A．B．ItthatwhenC．sinceD．before12．Heglancedattheinstrumentpanel_________saw，atlast，theblacknumbersflashingonthetinyGPSscreen．A．butB．andC．thatD．which13．Iwonder_________youwouldmindgivingmeahandforafewminutes．A．whatB．howC．ifD．that14．_________youarehere，you'dbetterstay．A．WhetherB．NowthatC．JustthatD．Sothat15．All_________Iwanttosayisthisthing．A．whatB．whichC．thatD．andB．Combinethetwosentencestogetherwiththegivenconnectives．1．Iliveinaroom．Itswindowopensnorth．（whose）2．Wewouldbeginthestreet．Wewouldnotgetmoneyinsuchadishonestway．（ratherthan）3．Hetoldustoreadthetextcarefully．Hetoldustowriteareviewofit．（and）4．Hesaidthathewasbusytoday．Hesaidthathewouldbefreetomorrow．（But）5．YesterdayIhappenedtomeetJohn．Hewaseagertohaveatalkwithyou．（who）C．Identifyingmistakes．Therearefourunderlinedpartsineachofthefollowingsentences．Identifytheonewhichiswrong．1．Manyschoolteachersareafraidtobringup(A)moralandspiritualquestions(B)forfearof(C)theyviolate(D)theConstitution．2．Doing(A)thingsoutofobligation，how(B)mucheffortyouputintoit(C)，alwaysbelike(D)draggingaballwillandchain．3．Arumor(A)hasgo