关于believe it or not

有一读者问:有这样一道选择题:

_____, the 21-year-old girl won three Olympic medals in track events.

A. Whether believe or not B. Believing it or not

C. To believe it or not D. Believe it or not

答案是D,是否由于D是一固定说法?

是的,它是一种固定的习惯说法,其义相当于whether you believe it or not,类似结构还有like it or not。