________necessary ________us_________exercise every day to keep healthy.请大伙帮我看看填什么单词,没有前后句,就这一句话如果填It’s necessary for us to 的话,后面应是do exercise,到底该填什么,我也给弄糊涂了

问题描述:

________necessary ________us_________exercise every day to keep healthy.
请大伙帮我看看填什么单词,没有前后句,就这一句话
如果填It’s necessary for us to 的话,后面应是do exercise,到底该填什么,我也给弄糊涂了

it's
for
to