To demonstrate the potential of this new approach, two filler geometrics () (use): sandglass and cheese segment. (在判断该句在摘要的哪部分内容
To demonstrate the potential of this new approach, two filler geometrics () (use): sandglass and cheese segment. (在判断该句在摘要的哪部分内容中出现的基础上,填入所给动词的适当形式)
正确答案:were used