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一、选择题 1.Millie’sresearchpaperisn’tuptostandard_________shehasworkedatitfortwoweeks. A.since B.unless C.if D.although 2.Plentyofideaswereconsidered________theartistdecidedonthedesignofthesculpture. A.before B.so C.unless D.because 3.________shecouldn’tseehisface,shecouldtellbyhisvoicethathewasyoung. A.Because B.If C.Though D.Unless 4.—Jenny,willyouleavefortheUKnow? —No.Itwillbetwoweeks________Ileavehere. A.until B.since C.before D.when 5.Alltheteenagersshouldkeeptakingexerciseeveryday________theyarebusystudyingsomanysubjects. A.until B.because C.unless D.though 6.You’ll________thewar________youwatchthefilm. A.feelsadabout;unless B.feelsadabout;if C.feelsadwith;unless D.feelsadwith;if 7.Therewillbefeweraccidents_______allofusobeythetrafficrule. A.if B.unless C.though D.because 8.Smilingisthebestpolicy.Peoplewillsmileback________yousmileatthem. A.unless B.although C.until D.when 9.Manypeopledonotrealizetheimportanceofhealth_________theyhavefallenill. A.until B.while C.when D.after 10.___________IhearKennyG'srecordingGoingHome,Ialwaysthinkofmyhometown. A.While B.Since C.Until D.Whenever 11.—ThenovelwrittenbyStephenseemsabitboringtome. —___________youputyourheartintoit,youwon'tenjoyit. A.When B.If C.After D.Unless 12.________thatmoment,Ineverrealizedhowmuchmyfatherlovedme. A.At B.Unless C.Until D.Since 13.Allstudentsshouldkeeptakingexerciseeveryday_______theyarebusystudyingsomanysubjects. A.until B.because C.though D.unless 14.MygrandmaenjoyssharingvideosonDouyinliketheyoung________sheisoverseventy. A.since B.if C.though D.unless 15.—WhatdoyouthinkofMr.Green,Tim? —Heissoboring.Hedoesn'thaveanyhobbies________youcallwatchingTVahobby. A.if B.unless C.since D.though 16.Maxgotlostandwastrappedintheforestfor10hours_______afarmernearbyfoundhim. A.if B.since C.until D.after 17.MyparentsgaveredpacketstomycousineverySpringFestival___________shegotajob,becauseshesaidshewasabletomakemoney. A.after B.when C.until D.since 18.—_______Dr.ZhongNanshanknewthatCOVID-19wasadeadlynewvirus,