Americansarebelieved()thefirstsatelliteintospace.我选的tolaunched,havelaunched,这句话有必要现在完成时吗?

Question

Americans are believed ( )the first satellite into space.
我选的to launched,have launched,这句话有必要现在完成时吗?

Answer 1

你好.应该是完成式的非谓语动词---------这叫做“用现在的眼光（are believed）看过去的事情（to have launched）”.又如：
It seems that she was here in this room yesterday.
--------- “用现在的眼光看过去的事情",就是：
She seemes to have been here in this room yesterday.