It is necessary for us good habits in our daily life.A. keepB. to keepC. keepingD. kept

问题补充：

It is necessary for us good habits in our daily life.

A. keep

B. to keep

C. keeping

D. kept

答案：

A. keep

(答案→)B. to keep

C. keeping

D. kept

解析：考查句型：it’s+形容词+for sb to do sth表示对某人来说做某事怎样。It 作形式主语，真正的主语是后面的不定式，句意：在我们的日常生活中对我们来说保持良好的习惯是必要的。所以选B。