The floor is so dirty .Would you please?A. to mop up it B. mop up itC. to mop it upD. mop

问题补充：

The floor is so dirty .Would you please?

A. to mop up it

B. mop up it

C. to mop it up

D. mop it up

答案：

A. to mop up it

B. mop up it

C. to mop it up

(答案→)D. mop it up

解析：考察代词作宾语及情态动词.代词做动词短语宾语时,代词要紧放在动词后,介词前.would是助动词,句子中缺少谓语动词,故不用不定式.选D.