问题
选择题
We must do something to _____ factories _____waste water into the river before it is cleaned.
A．stop; pouring .
B．prevent; to pour
C．keep; pouring
D．stop; to pour
答案
答案：A
搜题请搜索小程序“爱下问搜题”
We must do something to _____ factories _____waste water into the river before it is cleaned.
A．stop; pouring .
B．prevent; to pour
C．keep; pouring
D．stop; to pour
答案：A