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一、选择题 1.Theoldcoupleinsistonlivinginasmallvillageamongthemountains__________theycangetclosertonature. A.until B.unless C.eventhough D.sothat 2.Youwillgetatoothache_____________youcleanyourteethregularly. A.unless B.when C.though D.because 3.Atpresent,itisnoteasyforsomestudentstogetupearly________theyhavetoomuchhomeworktofinish. A.unless B.since C.asaresult D.although 4.—Asandstormhitthenorthafewweeksago.Itwasthestrongestintenyears. —Theenvironmentwon’tgetbetter________wetakeactiontoprotectit. A.if B.since C.though D.unless 5.—MyparentsgaveredpacketstomysistereverySpringFestival________shegotajob. —That’sbecauseyoursisterwasabletomakemoneybythattime. A.after B.when C.since D.until 6.MygrandmaenjoyssharingvideosonDouyinliketheyoung________sheisoverseventy. A.since B.if C.though D.unless 7.________shecouldn’tseehisface,shecouldtellbyhisvoicethathewasyoung. A.Because B.If C.Though D.Unless 8.Alltheteenagersshouldkeeptakingexerciseeveryday________theyarebusystudyingsomanysubjects. A.until B.because C.unless D.though 9.You’ll________thewar________youwatchthefilm. A.feelsadabout;unless B.feelsadabout;if C.feelsadwith;unless D.feelsadwith;if 10.—Whenwilltherailwaythatconnectsthetwocitiesopen? —nextyear.Onlytwothirdsbeenbuilt. A.Until;has B.Until;have C.Notuntil;has D.Notuntil;have 11.Therewillbefeweraccidents_______allofusobeythetrafficrule. A.if B.unless C.though D.because 12.Insummer,milkquicklygoesbad________itisputintoafridge. A.though B.unless C.because D.once 13.Allstudentsshouldkeeptakingexerciseeveryday_______theyarebusystudyingsomanysubjects. A.until B.because C.though D.unless 14._______theoutbreakofCOVID-19isaterribleblowtothecountry,thegovernmentistryinghardtobringthesituationundercontrol. A.Although B.If C.Unless D.However 15.Maxgotlostandwastrappedintheforestfor10hours_______afarmernearbyfoundhim. A.if B.since C.until D.after 16.We’renotveryclosefriends________we’veknowneachotherforalongtime. A.until B.although C.as D.if 17.—_______Dr.ZhongNanshanknewthatCOV