【谁能帮我解析几道英语习题1.Tomhadopenedthedoor_____maryhadtimetoknock.A.untilB.beforeC.asD.although2.It'shightimeyou______.A.doyouhomeworkB.wouldhavedoneyourhomeworkC.haddoneyourhomeworkD.didyourhomework3.The】

　　谁能帮我解析几道英语习题

　　1.Tomhadopenedthedoor_____maryhadtimetoknock.

　　A.untilB.beforeC.asD.although

　　2.It'shightimeyou______.

　　A.doyouhomeworkB.wouldhavedoneyourhomework

　　C.haddoneyourhomeworkD.didyourhomework

　　3.Thebuswsahelduponwaytotheairport,otherwiseI_____theplane.

　　A.mustcatchB.havecaughtC.couldhavecaughtD.oughttocatch

　　4.Let's____whenthetrainwillarrive.

　　A.discoverB.findC.findoutD.look

　　5.Ifthiscontinuestotskeplaceatthepresentrate,____anotherfiftyyears,theworldwillbecrowdedwithbigants.

　　A.atB.forC.inD.on

　　6.johnwill___Jacktobethegeneralmanager,forJackisgoningtochanngehiswork.

　　A.takeplaceB.taketheplaceofC.takehisplaceD.taketheplace