GRE Text Completion: Kaplan-GRE填空Kaplan - 7PP1HKL2895JC16G_

The aging engineer found it strange that the (i)____________ etching process she pioneered as a graduate student was still considered (ii)____________ after nearly four decades of continual use. A. porous B. antiquated C. innovative D. translucent E. implausible F. novel