题目内容
17．-Mario，your mobile phone is ringing．-Wait a minute．It's dangerous for us ______it while crossing the street．（ ）
| A． | answering | B． | to answer | C． | answer | D． | answered |
分析 --Mario，你的手机响了．
等一下．在穿过马路时接电话是危险的．
解答 答案：B．
A．answering 动名词或者现在分词； B．to answer 动词不定式； C．answer 动词原形； D．answered动词过去式．在it is+形容词 for sb to do sth，句式中it代替动词不定式做形式主语，结合句意，故选B．
点评 仔细分析句子的结构，掌握一些固定用法，根据具体内容作答．
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--Of course by credit card．（ ）
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| C． | why you paid for |
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