of the floor wet.A. Three quarter;isB. Three fourths; isC. Three fourth;areD. Three quar

问题补充：

of the floor wet.

A. Three quarter;is

B. Three fourths; is

C. Three fourth;are

D. Three quarters; are

答案：

A. Three quarter;is

(答案→)B. Three fourths; is

C. Three fourth;are

D. Three quarters; are

解析：英语中一般用基数词表示分数的分子，用序数词表示分数的分母。当分子是一时，分数的分母用单数形式，在表示分数时，当分数的分子大于一时，分数的分母要用复数形式。句意：地板的四分之三都湿了。有分数修饰的名词的单复数，与被修饰的名词保持一致，floor作为地板讲时，是不可数名词。故谓语动词用单数，选B。