Before____of synthetic(合成的) dyes(染料), yarns were often colored by
Before____of synthetic(合成的) dyes(染料), yarns were often colored by
发布时间:2021-04-12 03:49:48
Before____of synthetic(合成的) dyes(染料), yarns were often colored by dyes obtained from natural vegetable and mineral matter. (A) introducing (B) introduction (C) the introduction (D) introducing that