4.(2015山东临沂,26)—peopletraveleveryyear?—Perhapswhenwearetalkingaboutitmorethan100planeshavetakenoffaroundtheworld.A.HowmanyB.HowmuchC.HowlongD.Howoften
4.( 2015 山东临沂,26) — people travel every year?
—Perhaps when we are talking about it more than 100 planes have taken off around the world.
A. How many B. How much
C. How long D. How often
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