in, to, between; perfect, perfectly, perfactiveThis glass-making

2024-08-22 10:48:34
英语语法(00831)

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

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