可以讲一下专四语法嘛这题为啥选择c?
teacherTheBentPyramidoutsideCairo______ancientEgypt’sfirstattempttobuildasmoo...

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 展开
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 展开
2020-06-27
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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。
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