This pair of sunglasses _____ out of fashion.I’d like to buy a new ____.B.is,pair D.is,one

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This pair of sunglasses _____ out of fashion.I’d like to buy a new ____.B.is,pair D.is,one
This pair of sunglasses _____ out of fashion.I’d like to buy a new ____.
B.is,pair D.is,one

This pair of sunglasses _____ out of fashion.I’d like to buy a new ____.B.is,pair D.is,one
选B,this pair of 修饰名词时,谓语动词取决于pair,所以第一个空是单数,用is,第二个空不可以用one指代,one只指代可数名词单数,但不可指代量词,所以还用pair.

B
This pair of sunglasses is out of fashion. I’d like to buy a new pair.意为“这副太阳镜不时尚了,我想买一副新的”
第一句话的中心词是pair,所以谓语动词用单数is,第二个句子若填one,代替的是sunglass,显然不对,因为sunglass常用复数表达

到尺寸,颜色,价格。

选D 好一些,因为第二次用pair,前面已经有过this pair of,用one来代替更符合英语的用法。