题目内容
10．-It's our duty ________our city clean and beautiful．-Yes．We should do something for it．（ ）
| A． | to keep | B． | keep | C． | keeping |
分析 句意：-保持我们的城市干净美丽是我们的责任．-是的，我们应该为它做些事情．
解答 本题考查固定句型的用法，在句中it作形式主语，真正的主语是后面的to do不定式，所以用to keep，关选A．
点评 本题考查非谓语动词的用法，在平时的学习中注意积累与运用，达到熟练掌握的目的．
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