In the first company I worked for, I caused loss to the company due to my lack of experiences. As I had just been a technician in paper pattern, I ignored the fabric shrinkage different at each batch. Although I took the remedial action of adjusting washing time, washing temperature, cylinder speed and making different sets of paper pattern match with different batches fabric shrinkage, still have given rise to loss.

had just been，have given句中这两个时态我不是很确定，不知道用现在完成时，还是过去完成时？请教各位老师！