问题
选择题
. They did everything they could to prevent the pollution ______ the river.
A．protecting
B．to protect
C．from being protected
D．from protecting
答案
答案：B
搜题请搜索小程序“爱下问搜题”
. They did everything they could to prevent the pollution ______ the river.
A．protecting
B．to protect
C．from being protected
D．from protecting
答案：B