-Why were you so late for work today? - to the office was very slow this morning
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—Why were you so late for work today?
— to the office was very slow this morning because of the traffic.
A.Driving B. To drive C. I drove D. That I drove
试题答案
答案：B
解析：不定式做主语表示具体动作，含有“一次性”之意；动名词做主语一般表示泛指。D项做主语从句可以，但不合题意，因为事情不能有快慢，只能是动作有快慢。
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