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

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Britain’semissionsofgreenhousegases,blamedbymanyscientistsforcontributingtoglobalwarming,havefallenby14percent

M:Thetaxidrivermusthavebeenspeeding.W:Well,notreally.Hecrashedintothetreebecausehewastryingnottohitabox

Youaretowriteinnolessthan150wordsonthetopic"SecurityorPrivacy".YourcompositionshouldbebasedontheChinesec

One-roomschoolsarepartoftheheritageoftheUnitedStates,andthementionofthemmakespeoplefeelavaguelongforthew

Thecomprehensionpassagesonthiscoursearedesignedtohelpyouincreaseyourspeed.Ahigherreadingrate,withnolossofc

Populationstendtogrowatanexponential(指数的)rate.Thismeansthattheyprogressivelydouble.Asanexampleofthistypeof

Inanaveragewinter,highwaydepartmentsspreadsometenmilliontonsofsalttokeeproadssafe.Thecorrosiveeffectsarewel

Americaisthelandoftheautomobile.Thiscountryhasonly6percentoftheworld’spopulationoutof46percentoftheworld’

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