题目内容
2．Be careful ________ the street when you are alone．（ ）| A． | to cross | B． | with cross | C． | crossing | D． | of crossing |
分析 当你独自过街时，要小心．
解答 答案：A．考查不定式．句意"当你独自过街时，要小心．"．A不定式．B不正确．C动名词/现在分词．D介词+动名词．be careful to do sth小心做某事，固定搭配．选A．
点评 不定式在句子中可做主语、宾语、表语、定语、状语和宾语补语．要结合语境选择合适用法，注意一些固定搭配．
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