——What's wrong?You look unhappy____Three quarters of my books ____ missing.A have B is C was D are我知道是用BE动词,可是是用is 还是was 麻烦给我说明一下为什么,

——What's wrong?You look unhappy____Three quarters of my books ____ missing.A have B is C was D are我知道是用BE动词,可是是用is 还是was 麻烦给我说明一下为什么,
——What's wrong?You look unhappy
____Three quarters of my books ____ missing.
A have B is C was D are
我知道是用BE动词,可是是用is 还是was 麻烦给我说明一下为什么,

——What's wrong?You look unhappy____Three quarters of my books ____ missing.A have B is C was D are我知道是用BE动词,可是是用is 还是was 麻烦给我说明一下为什么,
分数+名词作主语,谓语动词的单复数取决于分数后的名词的单复数,此题名词为books是复数,所以选are

选D,因为Three quarters of my books是复数，所以谓语动词要用复数形式。

选D，因为books是可数名词，翻译过来是我四分之三的书不见了。