---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
---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
D
略