—I'm sure Andrew will win the first prize in the final.
—I think so. He( )for it for months. ( )
A.is preparing B.was preparing C.had been preparing D.has been preparing正确答案D
—I'm sure Andrew will win the first prize in the final.
—I think so. He( )for it for months. ( )
A.is preparing B.was preparing C.had been preparing D.has been preparing正确答案D
