到底是"it's common knowledge"还是"it's a common knowledge"?

到底是"it's common knowledge"还是"it's a common knowledge"?
到底是"it's common knowledge"还是"it's a common knowledge"?

到底是"it's common knowledge"还是"it's a common knowledge"?
绝对是：it's a common knowledge.一般用“It's a common knowledge that...”表达这是一种常识.固定搭配.放心啦~还有类似表达：“It's a common sense.”

"it's a common knowledge

没有a的