题干
There is water everywhere. Who's going to ?
A：mop up it
B：mop up them
C：mop it up
D：mop them up
答案(点此获取答案解析）
C
There is water everywhere. Who's going to ?
A：mop up it
B：mop up them
C：mop it up
D：mop them up
，
，则角A=（ ）.