Question

there was once a tiam when

()we held a concert once a month at university.
A there was a time when B there was a time that C we had time when D we had a time that
该选哪个?

Answer 1

A There was a time when 为正确选项.
there be a time when...可以说是个固定句型,“（曾经）有一段...的时光/日子”的意思.这是个定语从句,先行词a time,关系副词when,修饰a time..
再如：There was a time when we classmates went dancing at our college./ There was a time when the new couple quarreled with each other at the beginning of their marriage.
这个句型还可以演化为 sb have / has a time when...如：Everybody has a time when he feels down“人人都有失落的时候.”.