in, to, between; perfect, perfectly, perfactive This glass-making method was very effective as the glass had not touched any surfaces ____ being soft and becoming hard, so it stayed ____ unblemished.
in, to, between; perfect, perfectly, perfactive This glass-making method was very effective as the glass had not touched any surfaces ____ being soft and becoming hard, so it stayed ____ unblemished. 【正确答案】：between, perfectly
