来自曹怀虎的问题
Peoplearerecyclingmanythingswhichtheyawayinthepast．（）A.hadthrownB.willbethrowingC.werethrowingD.wouldhavethrown
People are recycling many things which they away in the past．（）
A.had thrown
B.will be throwing
C.were throwing
D.would have thrown
