Question

【题目】Many people have health problems.It is necessary for us every day.

A. to exercise B. exercising C. exercises D. exercise

Answer 1

【答案】A

【解析】

句意：许多人有健康问题，我们每天都需要锻炼身体。考查动词不定式。固定句型It is +形容词词+for sb. to do sth.：对于某人来说，做某事是什么样子的，it是形式主语，to do sth.是真正主语；结合句意可知填to exercise；选A。