_____is important_____us to have healthy habits.

A. It, to B. It, for C. That, to D. That, for

B

句意：健康的习惯对我们很重要。本题考查固定句型：It is +形容词+for sb. to do sth. 对某人来说做某事怎么样？本题中的it为形式主语，而后面的动词不定式是真正的主语。排除C/D；第二个空的介词用for而不用to。故选B。