B．efore the first non-stop flight made in 1949, it ________ necessary for all planes to land for refueling.

A．) would be         B) has been     C) had been        D) would have been

 

[试题]Beforethefirstnon-stopflightmadein1949,it________necessaryforallplanestolandforrefueling.A．)wouldbeB)hasbeenC．)hadbeenD)wouldhavebeen

[单选题]---What should I do first before boarding? ----().A．You may ask the policeman there to help.B．Please go to the airline counter to check-in for your flight.C．You should wait and see.D．You have to go there to check in for your flight.

[单选题]24．The Egyptians made the first balls with _________ ．A． animal skinB． something lightC． leaves and vinesD． paper

[单选题]I _____my former manager when I was on a flight to Beijing.A.ran intoB.took

[主观题]Icaughta__________ofthetaxibeforeitdisappearedaroundthecornerofthestreet.A．)visionB)glimpseC．)lookD)scene

[单选题]If I made amistake,I will try to [remedy] it.A.clarifyB. diagnoseC. evapora

[单选题]If I made amistake,I will try to [remedy] it.A.clarifyB.diagnoseC.evaporate

[单选题]Must I be home before seven?_________。A.No, you needn'tB.No, you mustn'tC.Y

[单选题]I have a lot of readings _____ before the end of this term.A． completingB． to completeC． completedD． being completed

[单选题]B．efore the sales start, I make a list of ______ my kids will need for the coming season.A． whyB． whatC． howD． which