问题
选择题
Every year about one million tourists visit Stonehenge, which is believed __________before the Pyramids, about 4,000 years ago.
A．to build
B．to have built
C．to be built
D．to have been built
答案
D
本题考查不定式的用法。be believed to have done意为“据认为做过了某事”，本题中StonehengeStonehengeS与build之间是被动关系之故用完成被动体。