I ______on the door for ten minutes now without an answer.

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问题 I ______on the door for ten minutes now without an answer.

选项 A、was knocking
B、am knocking
C、knocking
D、have been knocking

答案D

解析本题测试时态。本句的意思是： “我直到现在敲了 10分钟门也没人回答。”“have been doing”是现在完成进行时，表示从过去某一时间开始持续到现在的动作。例如：He has been waiting for you for the whole morning，(他等了你整整一个上午了。)

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成人本科学位英语

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I ______on the door for ten minutes now without an answer.

成人本科学位英语

______isgenerallyaccepted,economicalgrowthisdeterminedbythesmoothdevelopmentofproduction.

TheChinesehaveusedamethodcalledacupuncture(针灸)toperformoperationsforabout4,000yearswithoutputtingthepatientt

Agoodmodernnewspaperisanextraordinarypieceofreading.Itisremarkablefirstforwhatitcontainstherangeofnewsfrom

Modernscientistsdividetheprocessofdyingintotwophases—clinicalortemporarydeathandbiologicaldeath.Clinicaldeatho

IfEuropeansthoughtadroughtwassomethingthathappenedonlyinAfrica,theyknowbetternow.Afterfouryearsofbelownorma

Treesareusefultomaninthreeveryimportantways:theyprovidehimwithwoodandotherproducts;theygivehimshade;theyh

Americaisthelandoftheautomobile.Thiscountryhasonly6percentoftheworld’spopulationoutof46percentoftheworld’

AprovenmethodforeffectivetextbookreadingistheSQ3RmethoddevelopedbyFrancisRobinson.Thefirststepistosurvey(th

China’sactiveparticipationininternationalinstitutionscreatesmorechancestobringcooperationonkeyissues.Moreover,Ch

IfI______thebooksonthereadinglistbefore,Iwouldhaveattendedthelecture.

Working-classfamiliesintheUnitedStatesareusuallynuclear,andmanystudiesindicatethatworking-classcouplesmarryfor

A、血尿消失即可B、血压正常即可C、水肿消失，血压正常，肉眼血尿消失D、血沉正常E、阿迪氏计数急性肾炎患儿恢复参加体育运动的指征

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