题干
The floor in the classroom is very dirty. Will you please _________?
A：to mop up it
B：mop up it
C：to mop it up
D：mop it up
答案(点此获取答案解析）
D
The floor in the classroom is very dirty. Will you please _________?
A：to mop up it
B：mop up it
C：to mop it up
D：mop it up
