do you think___ important to keep our environment clean?A、it B、that C、this D、one 应该选哪个

问题描述:

do you think___ important to keep our environment clean?A、it B、that C、this D、one 应该选哪个

A
do you think是插入语
It is important to keep our environment clean.
[it 作先行代词,引导作为逻辑主语或宾语的从句]: