高中关于时态的英语选择题求解!
(B)I'mafraidthere'snomorebread.We_italllastnight.Inanycase,it_stale.
A.wereeating,wentB.ate,wasgoingC,haveeaten,wentD.hadeaten,hadgone
(A)Theterrorists_withthegovernmentofficialsalthoughtheyhadn'tgivenup.
A.werealreadynegotiatingB.alreadynegotiateC.havealreadynegotiatedD.havealreadybeennegotiating
(B)AlthoughIknowPicassowasoneofthegreatestartistsofhistime,Istill_hispatintingsexceptforthosepatintedduringhisBluePeriod.
A.don'teverenjoyB.haven'teverenjoyedC.amnoteverenjoyingD.hadn'teverenjoyed
(B)Untilnowresearchandtreatmentforoverweight_ondrugstodecreaseappetiteandsurgery.
A.focusedB.havefocusedC.arefocesingD.werefocusing
(A)Competitionforadmissiontothecountry'stopprivateschools_toughsincefewpublicschoolscancomparefavorablywithprivateschools.
A.hasalwaysbeenB.isalwaysbeenC.hadalwaysbeenD.wasalways
(C)Ashehasmetthecompany'squalifications,he_inanofficeasajuniorclerk.
A.willsoonhaveworkedB.shallsoonworkC.willsoonbeworkingD.wouldsoonbeworking
(A)Bytheendofthe18thcentury,thecity'spopulation_abouttwomillion.
A.wasB.wereC.hadbeenD.being
求选择题理由,ABCD都要!!谢谢!