The floor is so wet. Let’s .A. stop mopping it upB. stop to mop it up.C. stop mopping up

问题补充：

The floor is so wet. Let’s .

A. stop mopping it up

B. stop to mop it up.

C. stop mopping up it

D. stop to mop up it

答案：

A. stop mopping it up

(答案→)B. stop to mop it up.

C. stop mopping up it

D. stop to mop up it

解析：句意：地板很湿。让我们停下来把它清理干净。Let sb do sth让某人做某事；stop doing sth停止做某事；stop to do sth停下来去做某事；mop ···up把···清理干净，是一个动词加副词构成的短语，代词宾语要放在其中间，所以选B。