题目内容
13．It's polite towait （等待） in line before getting on the bus．分析 翻译：上公共汽车以前排队等待是有礼貌的．
解答 wait表示等待，根据语境It's polite to后面跟动词原形．故答案为：wait
点评 本题考查词汇的惯用法．本题中it是形式主语，正真的主语是to wait in line before getting on the bus．
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