Question

可以讲一下专四语法嘛这题为啥选择c？


teacher
The Bent Pyramid outside Cairo ______ ancient Egypt’s first attempt to build a smooth-sided pyramid.

A. has been believed to have been

B. was believed to be

C. is believed to have been

D. is believed to be

Answer 1

答：本题之所以选择C项，是因为金字塔现在被认为怎么样的，故用is believed, 即用一般现在时的被动语态。而 is believed 后面要用不定式的完成式，那是因为在believe 的动作发生之前已发生或存在的事实（ have been ancient... ）.

Answer 2

谓语部分，强调被动，时态无法确定，所以is或was believed都可以，后面跟to do sth的表达方式，强调说话前就已经被认可。