Question

i remember numerous times____ my mother showed

Answer 1

that or which, 不填是因为：numerous times 在这里做的不是主语,也不是宾语,而是时间状语.

具体看来： My mother showed unconditional love and care. 这就是个完整的句子,有主语,有谓语,有宾语.所以不填that or which.

举个其他的例子,或许你就能够理解了：

I still remember the day (可以填：when 或者 on which) you went away.

你可以比较一下这两个句子：

1. I love China which has the largest population in the world. China 在从句中做主语,所以可以用which or that.

2. I love China where there are many people. China 在从句中做地点状语,where = in which