题目内容
4．It is our duty _________our hometown clean and beautiful．We must do something for it．（ ）| A． | to keep | B． | keeps | C． | keeping |
分析 让我们的家乡保持清洁和美丽是我们的义务．我们必须为它做些事情．
解答 答案：A 分析句子结构，这里考查的是it is+名词+to do sth．结构．为了避免句子头重脚轻，it位于开头是作形式主语，其真正的主语则是由后面的动词不定式充当的．据此后面应用keep的不定式to keep．故选A．
点评 本题考查动词不定式的用法．做题时注意分析句子结构，知道it is+名词+to do sth结构就不难做出答案．
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