题目内容

17．---Why were you so late for work today？
---        to the office was very slow this morning because of the traffic．（　　）
A．DrivingB．I droveC．To driveD．That I drove

分析 -为什么你今天迟到了？
-因为交通高峰期，所以驾车去办公室是很慢的．

解答 答案：A．
本题中的动名词driving to the office做为句子的主语，动名词做主语指经常性，习惯性的行为．B项不能做主语；C项不定式做主语是指一次性的行为；D项是主语从句做主语，但是意思不匹配．故选A．

点评 动名词做主语表示经常性，习惯性的动作．如果是单个的动名词做主语，谓语动词用单数形式．

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