Sir Alexander Fleming did not, as legend would have it, look at the mold on a piece of cheese and get the idea for penicillin there and then.上句可改写为:Sir Alexander Fleming did not look a...
If we_______200 years old,we______everything.A.were to be,could change B.had been,changed C.were,would have changed D.should be, changed.这道题,C为什么不对,从句对现在事实的...