英语关于时态的选择题

Question

Dinosaurs are though to_____millions of years ago.
A die out
B have died out
C having died out
D dying out
选择什么好呢？我选择了A

Answer 1

我觉得应该选A ago表示的是从现在算起一段时间以前，和动词过去式连用

Answer 2

be thought to have done sth某人被认为曾经做了，用于对过去的猜想
be thought to do sth 用于一般现在时
所以选B

Answer 3

B吧，恐龙已经灭绝了，而不是将要灭绝啊

Answer 4

B.have died out

Answer 5

选B