再问og5

5. Carbon-14 dating reveals that the megalithic monuments in Brittany are nearly 2,000 years as old as any of their supposed Mediterranean predecessors.
(A) as old as any of their supposed
(B) older than any of their supposed
(C) as old as their supposed
(D) older than any of their supposedly
(E) as old as their supposedly

B和D的区别在于supposed还是supposedly.大家有什么好的方法可以判断到底是用adj还是adv吗？

因为我记得有道tofel考题是用adv的，

2000年10月，18题

18．In the early 1900’s, Roy Harris created and promoted a distinctly American style of classical music and greatly influenced a number of composer in the United States.

supposed meditarranean predecessors

= supposed predecessors + meditarranean predecessors

supposedly meditarranean predecessors

= supposedly meditarranean + meditarranean predecessors 表达意思不对