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

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

【答案】A

【解析】

句意:許多人有健康問題,我們每天都需要鍛煉身體?疾閯釉~不定式。固定句型It is +形容詞詞+for sb. to do sth.:對于某人來說,做某事是什么樣子的,it是形式主語,to do sth.是真正主語;結(jié)合句意可知填to exercise;選A。

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